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