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