1.21 Gigawatts

A reference to the 1985 hit film "Back to the Future" in which the DeLorean time machine needed 1.21 Gigawatts in order to travel through time.

The Xbox360 achievement gives 25 gamerscore while the Playstation 3 trophy gives a "Bronze" trophy.

How to obtain
"Kill 25 enemies with shock weapons" Shock weapons are special weapons that shoot electrified rounds. An example of a shock weapon is the Tediore RV11-B, Shock weapons can be identified by the "lightning" icon under the picture of the weapon.