important addition to the ISL Master achievement:
do it much easier and in 2 minutes: Select the player of your choice in multiplayer. Select the tunnels arena. Once started, go to the smallest, northermost point. Once there, goblins will never reach you, because they don't see you. There are to sprites that respawn. Catch them and use their powers continuesly, and you will be done in about 2 minutes. 100 points, not even fighting once. good luck
PS: can be done with only one controller!