You can get up to £0.70 of free Green Man Gaming credit simply by playing Tales From The Borderlands: Episode 2 on Steam.
So long as you're signed up to the Playfire newsletter, link your Steam account and opt into the rewards scheme beta (there's an FAQ here explaining everything), you'll earn yourself a nice little stash to put towards your next purchase. Here are the achievements:
- Deal With a Ghost - £0.10
- Till Death Do Us Part - £0.10
- A Plan Came Together - £0.10
- Funeral Crashers - £0.10
- Classic Reflexes - £0.10
- Bro or Bot - £0.10
- Miracle of Atlas Engineering - £0.10
As far as I know, you don't need to have bought Tales From The Borderlands from Green Man Gaming to qualify for the rewards, which is good because it's cheaper on GamersGate.
Click here to read our Tales From the Borderlands: Episode Two - Atlas Mugged Review!