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 the Silver Claymore
Found all Heart Pieces.
Beat the “Aqueducts Area 2” level.
Found all Weapon Bags.
Obtained all shards.
Opened all level paths.
Beat the “Frozen Mines” level.
Found the Dark Armor.
Beat the “Underground Temple” level.
Obtained all relics.
Found the Steel Claymore.
Reach the final level blocked path.
Beat the “Devil’s Peak” level.
Found the Combat Armor.
Beat the “Dark Forest Area 2” level.
Play a game session for 2 hours.
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".