Break your CPU.

Kill five barnacles with one barrel.

Escape the apartment block raid.

please don't touch anything

Taunt GLaDOS in front of a camera in each of the five co-op courses

Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each

Never lose a cube in Chamber 6 of the Mass and Velocity co-op course

Never lose a cube in Chamber 6 of the Mobility Gels co-op course

Complete Course 4 with neither you nor your co-op partner dying

Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements

Drop your co-op partner in goo while they are gesturing by removing the bridge under them

Dance in front of a turret blocked by a hard light bridge in co-op

Place a portal under your co-op partner while they are gesturing

Win 3 co-op games of rock-paper-scissors in a row

Complete Portal.

Do whatever it takes to survive.

Refuse to solve the first test in Chapter 8

Catch a blue-painted box before it touches the ground

Break 11 test chamber monitors

Examine all the vitrified test chamber doors

Complete Test Chamber 10 in 70 seconds

24 hours of your life wasted

Eat 200 balls

Experience 500 Lua programming errors

Master the Excursion Funnel

Complete the first Conversion Gel test

Master the Propulsion Gel

Find a hidden portrait

Carry science forward

Discover the missing experiment

Master the Repulsion Gel

Break the rules in Test Chamber 07

Making Friends

Recruit an Operative in Campaign Mode after completing 'Reporting For Duty'

Play 20 different maps

Big Bully

Knock someone over

One small trip

Qualify from your first round

Hat Trick

Obtain at least 3 gold plorts from a single gold slime

Carousel

Incinerate an elder chicken

Renewal

Start bringing life back to the Glass Desert

While You Were Away

Return to the Ranch after more than 24 hours

The Adventure Continues!

Complete Adventure Mode and set out for what's next.

Diversification

Have at least 10 types of largos on the Ranch

You... Monster!

Send an adorable chick to a fiery end, the same place you're now destined to go

Ball Pit

Jump into a corral containing at least 40 slimes

Controlling the Chaos

Constrain more than 15 slimes in your vac stream at once while on the range

Hasty Exchange

Fulfill a Range Exchange request between Noon and 2 PM

Best of the Worst

Place a tarr on the #1 Slime Stage

Risky Business

Have at least 3 different types of largos in the same corral

That Only Works in Comic Books

Stand inside a rad aura for at least 15 seconds

Fireworks

Shoot a boom slime largo into the air that explodes before landing