Master the Repulsion Gel

Save a turret from redemption

Complete the first Hard-Light Surfaces test

Place a cube on a button without touching the cube

Reunite with GLaDOS

Perform a swipe-to-air Kick Combo!

Sprinted a Marathon!

You Bubblized a Hunter with his own live missile!

Purchase a rare weapon from a gunsmith.

Attain highest Fame rank and either highest Honor rank or lowest Honor rank.

Complete all instances of Professor Genki's Super Ethical Reality Climax.

Kill 50 brutes.