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