Here is the full list of all 30 Agent A: A puzzle in disguise achievements worth 1,000 gamerscore.
Infiltrate Ruby's secret lair
Locate Ruby La Rouge
Disable the house alarm system
Open a stone doorway
Disarm the electric pool
Access the hidden pool door
Hit the briefcase kill switch
Sneak into Ruby's hideout
Uncover Ruby's mission
Download Ruby's mission
Broadcast warning message to Agent B
Find Ruby's submarine
Sabotage Ruby's submarine
Look up glissando in a dictionary, you'll know what to do Agent... HINT: start from the marked key
Overflow the sink a second time
Shoot the gun range target 100 times
Make a 'Boing' sound 10 times quickly
Deliver a surprise to Onyx and you'll have an ally for life
Show us your DJ skills, scratch a record for 10 seconds
Give Agent A an 'electrifying' hairdo
Release your latest catch... HINT: not Ruby though
Collect the fish bones a second time
Investigate Ruby's phone call records
Find every spider web in Agent A
Give Günther (the crazy Norwegian bird) hiccups
The old phone in the shoe trick eh!? Find a shoe phone
Complete all conversations with Trevor
Complete all conversations with Günther
Give your new ally their favourite delicacy, prepared to perfection
Complete Agent A in less than 120 minutes