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