As Dark Reize, defeat 3 foes as you exit your Teleport in a single match
Set a game with 3 cpu-s all at level 1 (Polar Knight - he is the biggest target and the slowest) set that it is one hit kill. Just teleport at the cpu and do the basic attack, killing them instantly. Do this 2 more times during the match and you will get the achievement/feat.
Disclaimer: You don't need to kill three enemies at once or win the game by killing the enemy right after you teleport.