Here is the full list of all 88 AQtion achievements.
10000 Headshots
1000 Frags to the Chest
10000 Frags in the Stomach
10000 Frags in the Legs
10000 Frags with the MP5/10
10000 Frags with the M4
10000 Frags with the M3 Shotgun
10000 Frags with the Sniper Rifle
10000 Frags with the Handcannon
10000 Frags with the single MK23 Pistol
10000 Frags with Dual MK23
10000 Frags with Kicks
10000 Frags with Punches
10000 Frags with Throwing Knives
10000 Frags with Slashing Knives
10000 Frags with Grenades
10000 Frags while wearing Stealth Slippers
10000 Frags while wearing the Bandolier
10000 Frags while wearing the Kevlar Vest
10000 Frags while wearing the Kevlar Helmet
10000 Frags with Laser Sight equipped
10000 Frags with Silencer equipped
5000 headshot frags with a single MK23 Pistol