Oi all ,
To unlock this achievement You need to unlock 4 other.
* Zero to hero
* Defending champ
* Triple crown
* Fully loaded : in this one 16 of 20 golden badges are recquired.
I have not participate at the 4 endurance races
PS: You Will find the UK GINETTA G40 challenge in GT5 CLASS
( sorry for my english )
Good races ;)