7.86%
Aperture Science
Earn gold medals on all Portal challenges.
8.02%
Rocket Science
Earn silver medals on all Portal challenges.
8.12%
Basic Science
Earn bronze medals on all Portal challenges.
11.46%
Transmission Received
..?
11.72%
Camera Shy
Detach security cameras from the walls.
19.29%
Vanilla Crazy Cake
Beat all six Portal advanced maps.
23.11%
Terminal Velocity
Fall 30,000 feet.
23.74%
Fruitcake
Beat four Portal advanced maps.
25.63%
Long Jump
Jump 300 feet.
33.72%
Cupcake
Beat two Portal advanced maps.
68.89%
Friendly Fire
Knock down a turret with another turret.
73.72%
Heartbreaker
Complete Portal.