To earn this achievement you have to go through a few steps.
- First, you must reach level 6 to have attained the specific amount of skill points needed (20 skill points).
- Second, you must use 9 skill points in both the "
Tech" and "
Biotic" skill tree to unlock the needed skills.
- Finally, purchase the "
Charge" skill from the Biotic Tree and the "
Tactical Cloak" from the Tech Tree.
Now that you have these, find an enemy and go invisible with the Tactical Cloak skill then use the Charge skill to kill that enemy. Doing this on Narrative or Casual will cause an instakill making this easier.
If you misplace your skill points you can always reallocate them in the tempest med-bay.