Oh that must have been a lot of work 
This is the list of actions, but often they require more parameters than just the number:
BTTPredefinedActionNOAction=-1,
BTTPredefinedActionAppleDefault=0,
BTTPredefinedActionMiddleClick=1,
BTTPredefinedActionCMDClick=2,
BTTPredefinedActionLeftClick=3,
BTTPredefinedActionRightClick=4,
BTTPredefinedActionExpose=5,
BTTPredefinedActionAppExpose=6,
BTTPredefinedActionSpaces=7,
BTTPredefinedActionDashboard=8,
BTTPredefinedActionLoginScreen=9,
BTTPredefinedActionFinder=10,
BTTPredefinedActionZoomIn=11,
BTTPredefinedActionZoomOut=12,
BTTPredefinedActionSleepDisplay=13,
BTTPredefinedActionSleepComputer=14,
BTTPredefinedActionLogout=15,
BTTPredefinedActionHiddenFiles=16,
BTTPredefinedActionMoveWindowLeft=17,
BTTPredefinedActionMoveWindowRight=18,
BTTPredefinedActionMaxWindowLeft=19,
BTTPredefinedActionMaxWindowRight=20,
BTTPredefinedActionMaxWindow=21,
BTTPredefinedActionMute=22,
BTTPredefinedActionPlay=23,
BTTPredefinedActionVolumeUp=24,
BTTPredefinedActionVolumeDown=25,
BTTPredefinedActionBackwards=26,
BTTPredefinedActionForward=27,
BTTPredefinedActionBrightnessUp=28,
BTTPredefinedActionBrightnessDown=29,
BTTPredefinedActionEject=30,
BTTPredefinedActionIlluminationUp=31,
BTTPredefinedActionIlluminationDown=32,
BTTPredefinedActionF1=33,
BTTPredefinedActionF2=34,
BTTPredefinedActionF3=35,
BTTPredefinedActionF4=36,
BTTPredefinedActionF5=37,
BTTPredefinedActionF6=38,
BTTPredefinedActionF7=39,
BTTPredefinedActionF8=40,
BTTPredefinedActionF9=41,
BTTPredefinedActionF10=42,
BTTPredefinedActionF11=43,
BTTPredefinedActionF12=44,
BTTPredefinedActionDesktop=45,
BTTPredefinedActionAppSwitcher=46,
BTTPredefinedActionNextMonitor=47,
BTTPredefinedActionMaxNextMonitor=48,
BTTPredefinedActionLaunchApp=49,
BTTPredefinedActionHideAllWindows=50,
BTTPredefinedActionPageForward=51,
BTTPredefinedActionPageBackward=52,
BTTPredefinedActionHideAllButActive=53,
BTTPredefinedActionDoubleClick=54,
BTTPredefinedActionRestartBTT=55,
BTTPredefinedActionQuitBTT=56,
BTTPredefinedActionOpenBTTPreferences=57,
BTTPredefinedActionOneFingerSearch=58,
BTTPredefinedActionOpenURL = 59,
BTTPredefinedActionPageUp=60,
BTTPredefinedActionPageDown=61,
BTTPredefinedActionHome=62,
BTTPredefinedActionEnd=63,
BTTPredefinedActionForwardDelete=64,
BTTPredefinedActionStartDrag=65,
BTTPredefinedActionStopDrag=66,
BTTPredefinedActionMoveTablet = 67,
BTTPredefinedActionToggleMagicMouseTouchpadMode = 68,
BTTPredefinedActionStartMovingWindows=69,
BTTPredefinedActionStopMovingWindows=70,
BTTPredefinedActionStartResizingWindows = 71,
BTTPredefinedActionStopResizingWindows=72,
BTTPredefinedActionToggleResizingWindows=73,
BTTPredefinedActionToggleMovingWindows=74,
BTTPredefinedActionBeginGesture=75,
BTTPredefinedActionEndGesture=76,
BTTPredefinedActionSwipeLeft=77,
BTTPredefinedActionSwipeRight=78,
BTTPredefinedActionSwipeUp=79,
BTTPredefinedActionSwipeDown=80,
BTTPredefinedActionRotateLeft=81,
BTTPredefinedActionRotateRight=82,
BTTPredefinedActionEndGestureImmediately=83,
BTTPredefinedActionRestoreOldWindowSize=84,
BTTPredefinedActionCreateNewFile=85,
BTTPredefinedActionFreeMenubar=86,
BTTPredefinedActionCtrlClick = 87,
BTTPredefinedActionAltClick=88,
BTTPredefinedActionShiftClick=89,
BTTPredefinedActionResizeToTopLeftQuarter=90,
BTTPredefinedActionResizeToBottomLeftQuarter=91,
BTTPredefinedActionResizeToTopRightQuarter=92,
BTTPredefinedActionResizeToBottomRightQuarter=93,
BTTPredefinedActionShowColorPicker=94,
BTTPredefinedActionMoveBottomHalf = 95,
BTTPredefinedActionMoveTopHalf = 96,
BTTPredefinedActionCenter = 97,
BTTPredefinedActionCenterNext = 98,
BTTPredefinedActionWindowSwitcher = 99,
BTTPredefinedActionWindowSwitcherAllApps=100,
BTTPredefinedActionToggleBTT=101,
BTTPredefinedActionCloseWindowUnderCursor=102,
BTTPredefinedActionExposeAndSort=103,
BTTPredefinedActionTerminateBTTImmediately=104,
BTTPredefinedActionShowBTTPreferences=105,
BTTPredefinedActionMinimizeWindowUnderCursor=106,
BTTPredefinedActionZoomWindowUnderCursor=107,
BTTPredefinedActionResizeToLeftThird=108,
BTTPredefinedActionResizeToMiddleThird=109,
BTTPredefinedActionResizeToRightThird=110,
BTTPredefinedActionCMDShiftClick=111,
BTTPredefinedActionFullScreen=112,
BTTPredefinedActionSwitchSpaceLeft=113,
BTTPredefinedActionSwitchSpaceRight = 114,
BTTPredefinedActionLaunchpad = 115,
BTTPredefinedActionLookup = 116,
BTTPredefinedActionSmartZoom = 117,
BTTPredefinedActionPasteString=118,
BTTPredefinedActionCustomClick=119,
BTTPredefinedActionBrightnessUpOnExternal = 120,
BTTPredefinedActionBrightnessDownOnExternal = 121,
BTTPredefinedActionNotificationCenter = 122,
BTTPredefinedActionToggleCursorSize = 123,
BTTPredefinedActionTriggerMenuItem = 124,
BTTPredefinedActionShowMenubarInContextMenu = 125,
BTTPredefinedActionToggleMouseSpeed=126,
BTTPredefinedActionAirplayMirroring=127,
BTTPredefinedActionSendShortcutToSpecificApp=128,
BTTPredefinedActionDelay = 129,
BTTPredefinedActionF13=130,
BTTPredefinedActionF14=131,
BTTPredefinedActionF15=132,
BTTPredefinedActionF16=133,
BTTPredefinedActionF17=134,
BTTPredefinedActionF18=135,
BTTPredefinedActionPostDistributedNotification=136,
BTTPredefinedActionTerminalCommand = 137,
BTTPredefinedActionAutomatorWorkflow = 138,
BTTPredefinedActionSwitchToPreset = 139,
BTTPredefinedActionToggleMouseCursorHidden = 140,
BTTPredefinedActionToggleLeap = 141,
BTTPredefinedActionAppSwitcherBackward = 142,
BTTPredefinedActionEnabledLeapMouseControl = 143,
BTTPredefinedActionDisableGestureRecognition = 144,
BTTPredefinedActionDockQuitApp = 145,
BTTPredefinedActionDockMinimize = 146,
BTTPredefinedActionDockApplicationExpose = 147,
BTTPredefinedActionDockSendKeyboardShortcut = 148,
BTTPredefinedActionCMDDoubleClick = 149,
BTTPredefinedActionIfMouseHoversDockIconEnableIt = 150,
BTTPredefinedActionMoveWindowToLeftSpace = 151,
BTTPredefinedActionMoveWindowToRightSpace = 152,
BTTPredefinedActionChangeMousePosition = 153,
BTTPredefinedActionSaveCurrentMousePosition = 154,
BTTPredefinedActionRestoreSavedMousePosition = 155,
BTTPredefinedActionEmptyTrash = 156,
BTTPredefinedActionOpenFinderSelectionWithApp = 157,
BTTPredefinedActionLockScreen = 158,
BTTPredefinedActionUnlockScreen = 159,
BTTPredefinedActionStartRecordingMouseGesture=160,
BTTPredefinedActionStopRecordingMouseGesture=161,
BTTPredefinedActionTriggerContextMenuItem=162,
BTTPredefinedActionElCapitanSplitScreenLeft=163,
BTTPredefinedActionElCapitanSplitScreenRight=164,
BTTPredefinedActionMissionControlAndShowDesktopPreview=165,
BTTPredefinedActionToggleSiriRemoteTouchpadMode = 166,
BTTPredefinedActionShowCharacterPalette = 167,
BTTPredefinedActionTriggerSnapArea = 168,
BTTPredefinedActionScreenshot = 169,
BTTPredefinedActionScreenshotWindow = 170,
BTTPredefinedActionScreenshotAndEdit = 171,
BTTPredefinedActionRunAppleScriptString = 172,
BTTPredefinedActionStartSiri= 173,
BTTPredefinedActionResizeToLeftTwoThird= 174,
BTTPredefinedActionResizeToRightTwoThird= 175,
BTTPredefinedActionOpenSelectedFolderWithApp = 176,
BTTPredefinedActionShowHideSpecificApp = 177,
BTTPredefinedActionModShiftDown = 178,
BTTPredefinedActionModShiftUp = 179,
BTTPredefinedActionModFNDown = 180,
BTTPredefinedActionModFNUp = 181,
BTTPredefinedActionModCtrlDown = 182,
BTTPredefinedActionModCtrlUp = 183,
BTTPredefinedActionModOptDown = 184,
BTTPredefinedActionModOptUp = 185,
BTTPredefinedActionModCMDDown = 186,
BTTPredefinedActionModCMDUp = 187,
BTTPredefinedActionToggleTouchBar = 188,
BTTPredefinedActionESC = 189,
BTTPredefinedActionToggleShowGlobalTouchBar = 190,
BTTPredefinedActionCloseCurrentTouchBarGrop = 191,
BTTPredefinedActionTypeString = 193,
BTTPredefinedActionToggleCapsLock = 194,
BTTPredefinedActionRunAppleScriptInBackgroundString = 195,
BTTPredefinedActionAddNewSpace = 196,
BTTPredefinedActionToggleDarkMode = 197,
BTTPredefinedActionVolumeUpLittle = 198,
BTTPredefinedActionVolumeDownLittle = 199,
BTTPredefinedActionToggleDoNotDisturb = 200,
BTTPredefinedActionToggleNightShift = 201,
BTTPredefinedActionStartScreenSaver = 202,
BTTPredefinedActionShowClipboardManager = 203,
BTTPredefinedActionBringWindowUnderCursorToFront = 204,
BTTPredefinedActionOpenTouchBarGroupWithName = 205,
BTTPredefinedActionShellTask = 206,
BTTPredefinedActionSwitchToDesktop1=207,
BTTPredefinedActionSwitchToDesktop2=208,
BTTPredefinedActionSwitchToDesktop3=209,
BTTPredefinedActionSwitchToDesktop4=210,
BTTPredefinedActionSwitchToDesktop5=211,
BTTPredefinedActionSwitchToDesktop6=212,
BTTPredefinedActionSwitchToDesktop7=213,
BTTPredefinedActionSwitchToDesktop8=214,
BTTPredefinedActionSwitchToDesktop9=215,
BTTPredefinedActionMoveWindowToDesktop1=216,
BTTPredefinedActionMoveWindowToDesktop2=217,
BTTPredefinedActionMoveWindowToDesktop3=218,
BTTPredefinedActionMoveWindowToDesktop4=219,
BTTPredefinedActionMoveWindowToDesktop5=220,
BTTPredefinedActionMoveWindowToDesktop6=222,
BTTPredefinedActionMoveWindowToDesktop7=223,
BTTPredefinedActionMoveWindowToDesktop8=224,
BTTPredefinedActionMoveWindowToDesktop9=225,
BTTPredefinedActionSwitchToDesktop10=226,
BTTPredefinedActionSwitchToDesktop11=227,
BTTPredefinedActionSwitchToDesktop12=228,
BTTPredefinedActionSwitchToDesktop13=229,
BTTPredefinedActionSwitchToDesktop14=230,
BTTPredefinedActionSwitchToDesktop15=231,
BTTPredefinedActionSwitchToDesktop16=232,
BTTPredefinedActionSwitchToDesktop17=233,
BTTPredefinedActionSwitchToDesktop18=234,
BTTPredefinedActionSwitchToDesktop19=235,
BTTPredefinedActionMoveWindowToDesktop10=236,
BTTPredefinedActionMoveWindowToDesktop11=237,
BTTPredefinedActionMoveWindowToDesktop12=238,
BTTPredefinedActionMoveWindowToDesktop13=239,
BTTPredefinedActionMoveWindowToDesktop14=240,
BTTPredefinedActionMoveWindowToDesktop15=241,
BTTPredefinedActionMoveWindowToDesktop16=242,
BTTPredefinedActionMoveWindowToDesktop17=243,
BTTPredefinedActionMoveWindowToDesktop18=244,
BTTPredefinedActionMoveWindowToDesktop19=245,
BTTPredefinedActionTerminalCommandBlocking = 246,
BTTPredefinedActionQuitAppUnderCursor=247,
BTTPredefinedActionTriggerNamedTrigger=248,
BTTPredefinedActionShowFloatingWebView=249,
BTTPredefinedActionCustomPaste=250,
BTTPredefinedActionCustomMoveResize=251,
BTTPredefinedActionRunJavaScriptInBackgroundString = 252,
BTTPredefinedActionRunJavaScriptOnMainThreadString = 253,
BTTPredefinedActionShowHUD = 254,
BTTPredefinedActionHapticFeedback = 255,
BTTPredefinedActionSaveSelectedTextToVariable = 256,
BTTPredefinedActionToggleTrueTone = 257,
BTTPredefinedActionTogglePreset = 258,
BTTPredefinedActionBrightnessUpLittle = 259,
BTTPredefinedActionBrightnessDownLittle = 260,
BTTPredefinedActionBrightnessExternalUpLittle = 261,
BTTPredefinedActionBrightnessExternalDownLittle = 262,
BTTPredefinedActionTakeScreenshotOrVideo = 263,
BTTPredefinedActionKeyboardShortcut = 264,
BTTPredefinedActionHideMenubarExtras = 265,
BTTPredefinedActionToggleMirroring = 266,
BTTPredefinedActionMoveAllWindowsToMouseDisplay = 267,
BTTPredefinedActionRestoreSavedWindowLayout = 268,
BTTPredefinedActionSaveCurrentWindowLayout = 269,
BTTPredefinedActionRestoreCurrentWindowLayout = 270,
BTTPredefinedActionConnectMIDIDevice = 271,
BTTPredefinedActionScroll = 272,
BTTPredefinedActionShowCustomContextMenu = 273,
BTTPredefinedActionConnectBluetoothDevice = 274,
BTTPredefinedActionDisconnectBluetoothDevice = 275,
BTTPredefinedActionToggleBluetoothDevice = 276,
BTTPredefinedActionEnableBluetooth = 277,
BTTPredefinedActionDisableBluetooth = 278,
BTTPredefinedActionToggleBluetooth = 279,
BTTPredefinedActionPlugin = 280,
BTTPredefinedActionRunCoreJavaScript = 281
Usually if you want to trigger a BTT action just configure a example trigger in BTT, select it and press cmd+c. The json copied to your clipboard will show all the parameters - it will also contain the trigger configuration, but you can remove that.