Here is the full list of all 26 Mercenary Kings achievements.
Collect over 2000 materials.
Defeat Commander Byron Baron once.
Rescue all 6 Kickstarter backer hostages.
Complete a mission with all parts of the SWAT-12 shotgun equipped.
Complete No Negotiation without saving any hostages.
Defeat the Steel Soldier using only your knife.
Clear all missions of any rank consecutively using the same gun parts.
Complete a mission in single player without getting hit.
Defeat over 1000 enemies.
Defeat a boss before it can escape.
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Defeat over 10000 enemies.
Unlock all Proficiencies.
Revive a teammate 10 times with the Adrenaline Shot.
Earn over $1,000,000.
Hunt over 250 animals.
Clear all missions of the game.
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.
Beat the fastest time of all missions of the game.
Craft all Bionic Mods.
Craft 20 Ornaments and 20 Banners.
Defeat the final boss.
Reach the Five-Star General rank.