Finish Chapter 1.
Finish Chapter 2.
Finish Chapter 3.
Finish Chapter 4.
Create your first chamber and upload it.
Create a story with at least 3 chambers and upload it.
Enlarge a test chamber with the global settings block.
Create a link with two global same-named portal doors.
Finish a chamber made by the community.
Finish 5 different chambers made by the community.
Finish 20 different chambers made by the community.
Reach 100% in Chapter 1.
Reach 100% in Chapter 2.
Reach 100% in Chapter 3.
Reach 100% in Chapter 4.
Lock up yourself inside a room in Chapter 2.
Carry an active turret.
Death is not the end. At least in a game.
Fly for the first time.
Get killed by two (or more) kinds of hassles at once.
Shoot a portal while you are in the air.
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