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