Full list of all 29 The Assembly achievements worth 1,000 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Xbox One.
Complete the obsolete Pillar Trial
Feed the dog
Complete The Assembly
Madeleine is offered a job at the Assembly
Meet the Director
Open the briefcase
Listen to Benson's voice message to Larson
Expel Gerard from his room
Hear Cal's Confession
Discover the preperation for Madeleine's trials
Retrieve your Portable Hard Drive
Complete your second trial
Gather all evidence
Give Larson's love note to Benson
Complete your first trial
Find the Casius-D dossier
Find the sandwich in samples fridge
Meet Dr Chevez
Discover Anton's investigation into the Director's illness
Continually stare at Dr Chevez
Attempt to leave the second trial with a dagger
Spot Dr Chevez
Reach the 4th year in any round of the Outbreak trial
Disable Silver Matter
Escape The Assembly
Discovered the Cryo experiment
Save the dog from Dr Chevez's experiment
Read all the magazines in the waiting rooms
Collect all Project Dossiers