Use cheats
Reach E2MS
Find Lavender's secret
Complete all three episodes
Find Rachael's secret
Earn the 'Completionist' award
Reach E3MS
Telefrag the Guardian
Pick up a bar of soap in each level
Find Dopefish
Kill Intoxigator while intoxicated
Find a "You aren't supposed to be here go away" sign
Get past wave 10 in Endless Mode
Earn the 'Untouchable' award
Get past wave 20 in Endless Mode
Get past wave 5 in Endless Mode
Reach E1MS
Earn the 'Pacifist' award
Neutralize Chomper
Complete episode 3
Beat a level on 'Duskmare'
Watch the credits to the end
Earn the 'Completionist' award in every level
Earn the 'Low Tech" award
Complete episode 2
Kill an enemy by spinning your weapons
Complete episode 1
Beat par time in a level
Find 'Wife of Intoxigator'