Portal 2 has a nice selection of regular story-driven rewards, along with ones for doing abstract actions in the campaign (such as finding certain Easter Eggs), as well as a nice helping of co-op Achievements/Trophies.
We're going to bypass showing you the ones you'll automatically earn as you finish the campaign or the co-op levels. You'll earn these as you play anyways, so we'll focus our attention on the ones you'll find 'off the beaten track' as it where.
They're organised in the order that you'll come across them in the campaign or the co-op mode. We'll also detail which chapter and chamber you need to be in to get it. Let's get started!
Door Prize
Examine all the vitrified test chamber doors
20
Drop Box
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
20
Final Transmission
Find the hidden signal in one of the Rat Man's dens
20
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
25
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
20
No Hard Feelings
Save a turret from redemption
10
Overclocker
Complete Test Chamber 10 in 70 seconds
30
Pit Boss
Show that pit who's boss
30
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
20
Preservation of Mass
Break the rules in Test Chamber 07
10
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
50
Pturretdactyl
Use an Aerial Faith Plate to launch a turret
5
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
20
Smash TV
Break 11 test chamber monitors
10
Still Alieve
Complete Course 4 with neither you nor your co-op partner dying
15
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
15
Wake up Call
Survive the manual override
5
You Made Your Point
Refuse to solve the first test in Chapter 8
10
Good Listener
Take GLaDOS' escape advice
5
Scanned Alone
Stand in a defective turret detector
5
Ship Overboard
iscover the missing experiment
10
Portrait of a Lady
Find a hidden portrait
10
