ACHIEVEMENT - HOW TO UNLOCK Fly Boy - Play one entire match in fly mode. Yin and Yang - 50 kills while in opposite orientation to the victim. Death From Above - 50 kills in fly mode against opponents in ground mode. Gung Ho - 10 kills during one round. The Cleaner - 3 kill streak. Rifleman - Kill 10 opponents with assault rifle. Sniper - Kill 10 opponents in scoped mode. Ventilate - Score 10 headshot kills. Ten in the Tank - Score 10 tankshot kills. Up Close and Personal - Score 10 melee kills. Last Line of Defence - Score 100 defense kills. Cyclops - Spend more than half the round in scoped mode. Marksman - Score a headshot from 200 meters or farther. Speedlane - 1 hour (3600 seconds) of boost time. Snipe This! - Kill an opponent with a melee attack while he is in scoped mode. The Assistant - Score 5 assist points in one match. Strafing Run - Kill 3 grounded opponents in 10 seconds in flight mode. Never Give Up - Capture 100 control points. No Electricity - Score 50 kills while being stunned by an EMP grenade. Ghost - Score 50 kills while running silent. Ghostbuster - Kill 50 opponents who are running silent. Empty Space - Score 1000 kills. Ruthless - Win 250 Skirmish matches. Unyielding - Win 250 Assault matches. Relentless - Win 250 Battle matches.