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