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