Here is the full list of all 29 Mechs & Mercs: Black Talons achievements.
Buy all the upgrades for the Paladin.
Have a unit survive 10 battles.
Develop a squad's skills to its maximum level.
Have an operator with maximum skill level.
Become an ally of the Santo's Raiders.
Become an ally of the Uver Liberation Army.
Become an ally of the Revati Global Corporation.
Become an ally of the Northstar Legion.
Become an ally of House Leonis.
Attack the enemy with a gunship.
Hire 5 new squads.
Help the Noctae Republic retake their planet.
Kill 100 enemy soldiers.
Complete mission "Incision"
Complete mission "Winter Rescue"
Complete mission "Desert Fire"
Complete mission "Assassination"
Complete mission "Bear Claw"
Complete mission "Black Moon"
Complete mission "Succubus"
Complete mission "Swarm"
Complete mission "Night Slash"
Complete mission "Valiant Guardian"
Complete mission "Wipeout"
Complete mission "Lonestar"
Complete mission "Red Citadel"
Complete mission "Bastion"
Become an ally of the Eternal Life Cult.
Complete mission "Battle Axe"