C. Combat

Monster Train Combat Achievements: Unlock Flyweight, Lightweight, Middleweight, Heavyweight, Superweight, Ultraweight, and Gladiator by winning combats.

Combat Achievements:

1. Weight Classes: Win combats to unlock these achievements: Flyweight (1 combat), Lightweight (5 combats), Middleweight (15 combats), Heavyweight (30 combats), Superweight (60 combats), Ultraweight (100 combats), and Gladiator (150 combats).
2. Part Knock-offs: Knock off enemy parts in combat to unlock these achievements: Lucky Hit (10 parts), Browbeater (30 parts), Haymaker (60 parts), Concussion (100 parts), Truncation (200 parts), and Amputation (400 parts).
3. Limb Knock-offs: Achieve these specific limb-related combat feats: Weak Point (win combat without knocking off any limbs) and Dismemberment (win combat by knocking off all limbs).
4. Defense: Block or dodge attacks to unlock achievements: Buffer (Block 25 attacks), Guard (Block 100 attacks), Sidestep (Dodge 25 attacks), and Evasion (Dodge 100 attacks).
5. Offense: Deal a significant amount of damage with a single attack to unlock Big Hit (deal 200 points of damage with one attack).
6. Boss Slayers: Defeat the boss of each world to unlock these achievements: Mechanical, Murky, Ghostly, Spare Parts, Foliage, and Baron Slayer.
7. Losses and Fleeing: Even losing combats or fleeing can unlock achievements: Defeat (lose 5 combats), Loser (lose 10 combats), Kamikaze (lose 20 combats), Separation (lose 5 limbs in combat), Warrenty (lose 20 limbs in combat), Flesh Wound (lose 50 limbs in combat), Escape (Flee combat 5 times), Worrisome (Flee combat 15 times), and Court Martial (Flee combat 30 times).