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