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