Here is the full list of all 21 Volgarr the Viking (EU) trophies - there are 7 bronze, 5 silver, 8 gold and 1 platinum.
Reach the alternate path for any world
Hitch a ride on a spear attached to an enemy shield
Collect a golden walrus statue
Unlock Mjolnir's power
Complete any world without ever losing any equipment
Complete any world in 4 minutes or less
Defeat the Lizardmen King
Obtain a Warrior Spirit
Kill 4 enemies with a single charged spear attack
Block an attack with the shield while on a rope/chain
Block a projectile with the shield while in the air
Wield the fire sword
Aquire all trophies and become a true Viking Legend!
Break the Magic Seal on Fafnir's Tower
Complete the game and earn Ending C
Complete the game and earn Ending B
Complete the game and earn Ending A
Find a Key Stone
Kill Fafnir before he reaches his Dragon form
Reach Yggdrasil's roots
Complete the game with 10 or less retries (deaths)