Unlocks when all achievements for Score Achiever, Coin Hunter and Monster Slayer have been unlocked
Unlocks randomly for every 50 coins collected
Unlocks at reaching High Score of 5000
Unlocks randomly for every 3 monsters killed
Unlocks at reaching High Score of 4000
Unlocks randomly for every 500 points scored
Unlocks at reaching High Score of 3000
Unlocks at reaching High Score of 2000
Unlocks at reaching High Score of 1000
Unlocks for EVERYONE when Total Coins collected by the community reaches 100,000
Unlocks for EVERYONE when Total Coins collected by the community reaches 250,000
Unlocks for EVERYONE when Total Coins collected by the community reaches 500,000
Unlocks for EVERYONE when Total Score achieved by the community reaches 1,000,000
Unlocks for EVERYONE when Total Score achieved by the community reaches 2,500,000
Unlocks for EVERYONE when Total Score achieved by the community reaches 5,000,000
Unlocks for EVERYONE when Total Monsters killed by the community reaches 10,000
Unlocks for EVERYONE when Total Monsters killed by the community reaches 25,000
Unlocks for EVERYONE when Total Monsters killed by the community reaches 50,000
Unlocks at collecting 200 Total Coins
Unlocks at collecting 400 Total Coins
Unlocks at collecting 600 Total Coins
Unlocks at collecting 800 Total Coins
Unlocks at collecting 1000 Total Coins
Unlocks after killing 20 Monsters
Unlocks after killing 40 Monsters
Unlocks after killing 60 Monsters
Unlocks after killing 80 Monsters
Unlocks after killing 100 Monsters
Unlocks when all achievements for High Scorer, Coin Collector and Monster Killer have been unlocked
Unlocks when all other achievements have been unlocked
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.
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