Step in a pile of excrement.
Complete "Lunar Apocalypse" on any difficulty or in co-op.
Complete "L.A. Meltdown" on any difficulty or in co-op.
Tip an exotic dancer.
Finish the "Hollywood Holocaust" level in under 3 minutes.
Get 100 total kills in ranked Dukematch games (Online).
Get 250 total kills in ranked Dukematch games (Online).
Earn respect and get 500 total kills in ranked Dukematch games (Online).
Complete "Shrapnel City" on any difficulty or in co-op.
Complete "The Birth" on any difficulty or in co-op.
Step on 40 enemies after using the Shrinker on them.
Find 70 secret areas.