By the Power of Gray-Skill...
Wield the fire sword
Let Off Some Steam, Bennett
Kill 4 enemies with a single charged spear attack
Nothing Can Stop Me
Block a projectile with the shield while in the air
Shield Gots My Back
Unlock Mjolnir's power
I Will Have My Vengeance!
Defeat the Lizardmen King
You've Got the Touch, You've Got the Powah!
Obtain a Warrior Spirit
What the Hel is "Nar-Nee-Yah"
On the Highway to Hel
Wealthier than the King of Sweden
Collect a golden walrus statue
Viking Nipples of Steel
Complete any world without ever losing any equipment
Sock It to Me Nakatomi
Break the Magic Seal on Fafnir's Tower
If It Bleeds, You Can Kill It
Complete the game and earn Ending C
Complete any world in 4 minutes or less
Volgarr...You're Sooo Smooth
Complete the game with 10 or less retries (deaths)
On the Wings of Glory
Complete the game and earn Ending B
Don't Nidhoggr All the Ale
Red Means Dead
Complete the game and earn Ending A