Full list of all 12 Delta Squad achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Survive at least 10 waves in survival mode
Kill 5 enemies with a single grenade
Starting, complete any level
Eliminate one of the bosses
Kill 3 enemies with a single grenade
Survive at least 5 waves in survival mode
Kill 50 Infantry soldiers
Heal yourself or heal someone else
Kill 25 Engineer soldiers
Destroy a tank
Kill 10 Heavy soldiers
Use your secondary weapon