Detune
Upload some music to your system, play that music while playing with detuned, and maximize one of the distortive sound effects.
11/22/2010
8:30:02 PM
Common 58.3%
Pump
Use the pump controls to pump up and release completely an effect.
11/22/2010
8:22:09 PM
Common 81.8%
Get Your Right Foot Wet
Complete a match in Competitive Co-Op mode. (Online co-op only)
11/12/2010
3:38:17 PM
Rare 16.8%
Raining Pain
Rack up a body count of 20 NVA using air support in Hue City.
11/11/2010
7:55:15 AM
Rare 32.6%