Here is the full list of all 26 Mercenary Kings achievements.
Complete a mission in single player without getting hit.
Defeat over 1000 enemies.
Defeat Commander Byron Baron once.
Complete a mission with all parts of the SWAT-12 shotgun equipped.
Complete No Negotiation without saving any hostages.
Defeat a boss before it can escape.
Clear all missions of any rank consecutively using the same gun parts.
Defeat over 10000 enemies.
Collect over 2000 materials.
Defeat the Steel Soldier using only your knife.
Unlock all Proficiencies.
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Rescue all 6 Kickstarter backer hostages.
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.