Here is the full list of all 51 Door Kickers: Action Squad achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Collect all 20 secret items
Use sniper support to kill 1000 enemies
Use 5 extra lives in the same mission
Resurrect another player 5 times in the same mission
Kill 3 enemies by blowing up one barrel
Disarm 30 bombs
Successfully complete all missions in Chapter 5
3-Star all missions in Chapter 5
Make 5 VIP Arrests
Blow Open 100 Doors
3-Star all missions in Chapter 4
Successfully complete all missions in Chapter 4
Use sniper support to kill 100 enemies
3-Star all missions in Chapter 3
Successfully complete all missions in Chapter 3
Rescue 1000 hostages
Unlock Chapter 5
Unlock Chapter 4
Set 20 enemies on fire
Unlock Chapter 3
Kill yourself with your own explosives
Kill 50 Hostages
Stun 500 enemies
Kick Open 1000 Doors
Kill 3 enemies with one breaching charge
Get 100 kills as Recon
Get 100 kills as Agent Fergie
Get 100 kills as Shield
Get 100 kills as Assaulter
Rescue 50 Wounded Policemen
Successfully complete all missions in Chapter 2
3-Star all missions in Chapter 2
Kill an enemy with an elevator
Unlock Chapter 2
Successfully complete all missions in Chapter 1
3-Star all missions in Chapter 1
Kill 1000 bad guys
Kick Open 100 Doors
Get 100 kills as Breacher
Complete a level without taking any damage whatsoever
Rescue 50 hostages
Collect your first secret item
Kill 50 bad guys
Get 3 stars in a mission
Win one mission in Coop