Full list of all 40 Them and Us achievements.
The base game contains 19 achievements, and there are 2 DLC packs containing 21 achievements.
Enter Dr. Arnold Howard's research chamber.
Unlock the door to the old tower.
Find a way to unlock the bow-gun mechanism.
Kill a stalker while executing an instant-death attack.
Listen to any Famous LP record from start to finish.
Unlock the main gate.
You awoke in the Master's house and have managed to escape. But the nightmare has only just begun.
Unlock Alicia’s base costume.
Kill all the shadow creatures on Fog Island.
Die for the first time.
Fight a Walker.
Kill all the enemies inside the mansion.
Unlock all rooms from the Mansion.
Finish the game without saving.
Obtain all weapons.
Finish the game in under 3 hours.
Finish the game on Hard difficulty.
Finish the game on Professional difficulty.
Finish the story in fixed camera mode.
Finish the game in Over The Shoulder mode.
Find all documents in the game.
Unlock all costumes.
Finish the story with an S+ Rank on "Professional".