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