Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Again	Completed Prologue.
All Aboard	Completed Act 3.
Clever	Solved Train Puzzle.
Commute	Completed Act 4.
Defender	Found All Weapons.
Forgive Forget	Completed Post Trauma.
It's Done	Ending B.
It's Over	Ending A.
One Eye Open	Completed Act 5.
Remember	Found All Tapes.
Scum	Survived encounter with the past.
Survivor	Killed a threat.
Tail End	Destroyed abomination.
Tunnel Vision	Completed Act 1.
Watcher	Completed Act 2.