Here is the full list of all 29 Odallus: The Dark Call achievements.
Completed the game.
Completed 100% of the game in normal mode.
Reach the final level blocked path.
Beat the “Devil’s Peak” level.
Obtained all shards.
Opened all level paths.
Found all Weapon Bags.
Found all Heart Pieces.
Beat the “Frozen Mines” level.
Found the Dark Armor.
Found the Silver Claymore
Beat the “Aqueducts Area 2” level.
Obtained all relics.
Beat the “Underground Temple” level.
Found the Steel Claymore.
Beat the “Dark Forest Area 2” level.
Play a game session for 2 hours.
Found the Combat Armor.
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.
???
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".