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