Here is the full list of all 12 Hell Yeah! Wrath of the Dead Rabbit achievements worth 400 gamerscore.
You mission freak!
Congratulations! Thanks for your hard work!
You did it on purpose?
Thanks for your help!
You got a full armoury!
You won the Grand Prize!
When you're the Boss, you have 365 birthdays.
You can ride for hours!
Wow! All these fancy things!
Ooooh! Poor thing! Want a cookie?
You are gifted, sir!
Now's the time to strike back!