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