To the surface and beyond
Hired
Volunteer
Pacifist
Complete the Chamber 4-9 without knocking over any turrets
Sending a message
Blow up a test chamber sign
Refreshing shower
Take a shower under one of the gel cleansing fields
Just in time
Deplete the conveyors' supply of Weighted Storage Cubes
Captivating Looks
Stare at Conly's mannequins for a really long time
Fingerprinter
Smear your dirty fingers over Aperture's beautiful glass
Journey Complete
New friends
Upgrade?
Let's do this one last time
Back to bed
Endless loop
Fling in an endless loop in Chamber 4-11
Supply Chain Problems
Deplete the gel supply in Chamber 4-11
Two times the charm
Solve the Chamber 6-2 twice
Still a pacifist
Complete Chamber 5-1 without destroying any turrets
The boring solution
Solve Chamber 6-6 the boring way
The fun solution
Solve Chamber 6-6 the fun way
Bullseye
Get the ball in 4-10 to land perfectly in the socket