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