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