Here is the full list of all 26 Mercenary Kings achievements.
Unlock all Proficiencies.
Craft over 100 knives and 300 gun parts.
Rescue all 6 Kickstarter backer hostages.
Clear all Major rank missions without using Rations nor First-Aid kits.
Collect over 2000 materials.
Defeat the final boss.
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Hunt over 250 animals.
Complete a mission with all parts of the SWAT-12 shotgun equipped.
Defeat the Steel Soldier using only your knife.
Defeat Commander Byron Baron once.
Complete No Negotiation without saving any hostages.
Defeat a boss before it can escape.
Defeat over 1000 enemies.
Complete a mission in single player without getting hit.
Clear all missions of any rank consecutively using the same gun parts.
Defeat over 10000 enemies.
Revive a teammate 10 times with the Adrenaline Shot.
Earn over $1,000,000.
Clear all missions of the game.
Activate all 14 food skills.
Clear all 10 Primary missions of the game with the Bolt 45.
Beat the fastest time of all missions of the game.
Craft all Bionic Mods.
Craft 20 Ornaments and 20 Banners.
Reach the Five-Star General rank.