The 12 Days of Pandora trophy in Borderlands: Game of the Year Edition will unlock through natural play, but if you want to try and get it out of the way ASAP, here are the 12 challenges you will need to complete:
12 kills with an assault rifle
11 kills with a pistol
10 kills with a shotgun
9 kills with an SMG
8 kills with a sniper rifle
7 melee kills
6 critical hits
5 explosive kills
4 shock kills
3 incendiary kills
2 corrosive kills
1 grenade kill
You can track your progress towards this trophy in the mission log and pressing
to list the challenges.