Complete the first three levels without any fail
Build all levels without switching to individual layers, with the level 3 exception.
Build 5 levels
Build 10 levels
Build 15 levels
Build 20 levels
Build 25 levels
Build 10 levels without using hints
Build level 2 in less than 4 minutes
Put the level 10 loopers correctly with the first check
Read the credits after complete the game
Build correctly your first Looper
Use the turbo for more than 6 seconds
Skip more than five levels
Build the level 16 switcher in the correct way for the first check
Pass the toilet paper to the scientist in need.
Perform surgical caffeine extraction from 20 machines.
Kill 10 Airborne Headcrabs using the Shotgun.
Kill 20 enemies with the Hivehand.
Ruin the microwave casserole.
Kill an Assassin with the .357 Magnum.
Kill 10 enemies with a reprogrammed Sentry.
Conduct all of the questionable research experiments.
Kill 10 enemies with Snarks.
Headshot 20 enemies with the .357 magnum.
Drown in Lambda Core's coolant.
Kill a Headcrab using fire.
Kill a Marine with their own grenade.
Kill 5 enemies with one grenade.
Kill an Icthyosaur with either the Tau or Gluon.
Use the alternate path in Office Complex.
Use an entire clip of Gluon ammo in one continuous shot.
Get overtaken by a Headcrab's ample anterior.
Interfere with the alarm and laptop in Anomalous Materials.
Overcharge it anyway.
Send the Hidden Hat to Xen.
Kill a Barnacle with a Satchel.
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Help the Barnacle and Headcrab find true love.
Get killed by your own Snarks.
