Here is the full list of all 23 Frontline Tactics achievements.
Perform slice and dice kills.
Kill! Kill! Kill!
Win some missions to get feet wet.
Blind and stun enemies.
Dual wield-r-us.
Swiftly defeat the enemy.
Pepper more than one target with bullets.
Knowledge is power!
First successful mission turn boys to men.
Win a lot of missions.
Unlock a little of everything.
Crossfire is good. More is better!
Use cover and survive longer.
Unlock everything.
Defeat enemies of flesh and bone.
Kill multiple enemies in a single burst.
Grow your squad.
Deploy and extract a full team.
Defeat enemy elite troops.
Grenade fragments makes enemies bleed.
More skills are better than few.
Horde a lot of credits.
Buying credits is totally OK!