Here is the full list of all 55 Wulverblade achievements.
Complete Stage 5 in Arcade mode
Impale 100 enemies on spikes
Beat the game in any mode as Brennus
Complete Stage 4 in Arcade mode
Complete Stage 3 in Arcade mode
Reach wave 10 in an arena
Defeat Bronwen without losing a life
Beat the game in any mode as Caradoc
Beat the game in any mode as Guinevere
Defeat the Primus Pilus without losing a life
Transformed into the Wulver for the first time
Defeat the praefectus without losing a life
Spared the sleeping Roman in Fort Bremenium
Kill 5000 enemies
Defeat the level 6 boss without losing a life
Counter 100 times
Defeat Arthal without losing a life
Hit 100 enemies with throwing knives
Defeat the level 1 boss without losing a life
Earn rank 3 on all campaign levels
Defeat the level 2 bosses without losing a life
Complete all levels under par time
Find the Golden Axe
Find eight secret areas in one session
Destroyed 1000 amount of Destructables
Kill 10 enemies during a single rage
Counter 50 times
Finish off 50 enemies with executions
Impale 25 enemies on spikes
Build up a 300 hit streak
Hit 100 enemies with dismembered pieces
Complete Stage 2 in Arcade mode
Complete Stage 1 in Arcade mode
Kill 3 enemies with fire within 10 seconds
Have a hot roasted turkey or ham when your health is already full
Kill 1000 enemies
Hit 5 enemies with one ground slam or heavy weapon jump slam
Hit 5 enemies at once with a single exploding barrel
Kill 500 enemies
Destroyed 100 amount of Destructables
Find one secret area
Find 25 history unlocks
Kill 250 enemies
Build up a 100 hit streak
Kill 100 enemies
Find 10 history unlocks
Build up a 25 hit streak
Reach wave 20 in an arena
Reach wave 30 in an arena
Complete arcade mode of the campaign
Complete Stage 6 in Arcade mode
Complete Stage 7 in Arcade mode
Finish off 250 enemies with executions
Impale 1000 enemies on spikes
Counter 500 times