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