Here is the full list of all 29 Odallus: The Dark Call achievements.
Completed the game.
Completed 100% of the game in normal mode.
Found all Heart Pieces.
Beat the “Frozen Mines” level.
Found all Weapon Bags.
Obtained all shards.
Found the Dark Armor.
Beat the “Aqueducts Area 2” level.
Found the Silver Claymore
Beat the “Underground Temple” level.
Opened all level paths.
Obtained all relics.
Reach the final level blocked path.
Beat the “Devil’s Peak” level.
Found the Combat Armor.
Found the Steel Claymore.
Play a game session for 2 hours.
Beat the “Dark Forest Area 2” level.
Beat the “Aqueducts” level.
Beat the “Dark Forest” level.
Beat the “Town” level.
Obtained 10.000 orbs (total) in a single game.
Spend 6.000 total orbs on the merchant.
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Beat the entire game only using Haggis' Sword.
Beat the entire game only using Hunting Clothes.
Completed the game in less than 2 hours.
Completed the game in "Veteran Mode".
Completed 100% of the game in "Veteran Mode".