Here is the full list of all 21 RICO achievements.
Reach level 14
Purchase all the weapons
Get a kill with a side arm, tactical weapon, and a grenade in the same room
Neutralise three or more criminals with one stinger in the same room
Complete a case
Complete a case on Hard difficulty
Knock down a criminal sliding into a room
Get one thousand kills
Revive another player five times
Knock off 50 masks
Get five hundred kills
Finish three operations losing less than ten health
Clear a room while in slow-mo ten times
Revive yourself five times
Complete a daily training session
Survive ten waves in lockdown mode
Survive five waves in lockdown mode
Get one hundred kills
Complete a daily operation
Get twenty melee kills
Complete a two-player operation