Here is the full list of all 26 Mercenary Kings achievements.
Defeat Commander Byron Baron once.
Rescue all 6 Kickstarter backer hostages.
Revive a teammate 10 times with the Adrenaline Shot.
Clear all missions of any rank consecutively using the same gun parts.
Collect over 2000 materials.
Defeat over 1000 enemies.
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.
Defeat over 10000 enemies.
Defeat the Steel Soldier using only your knife.
Unlock all Proficiencies.
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Earn over $1,000,000.
Hunt over 250 animals.
Complete a mission in single player without getting hit.
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.