Installation:

Make sure latest ScriptHookRDR2 is installed
Extract achievementScriptRDR2.7z to your Red Dead Redemption 2 folder
The game folder should now have a achievementScriptTestRDR2.asi
Run the game
Press F5 to run Achievements Script

Logging is currently done in "GameLog.txt".
Logging will be removed when script is out of beta. When facing bugs/issues please attach the log file too.
The trigger is not running in the background, that will be done in the coming updates.