After completing Omega DLC, go to Medical on the Normandy and interact with the first bed on the right.
Complete the Omega downloadable content to unlock two bonus powers.
With the Engineer class, you’ll be able to use the abilities to earn Shield Breaker and Pyromaniac.
Again, you don’t have to do this because you will have to play again, but it’s up to you. Below is the method to get all of them done during your initial playthrough. Gunsmith is going to require a partial second playthrough, so whatever biotic Trophy/Achievement you didn’t get on your first, you can knock out while finishing Gunsmith. There is a way to get all of the biotic related Trophies/Achievements done in one playthrough, but you don’t have to. I don’t know if it they are not meant to or if it is a bug, but I couldn’t get them to register. Unfortunately, using your teammates’ powers will not count toward those in ME3 like they did in ME and ME 2. Just like with the first two games, there are some biotic related Trophies and Achievements. If you haven’t already, you’ll also be finishing most of the separate Legendary Edition list here as well. There is no multiplayer (yet?) this time around. However, unlike the previous two games, Mass Effect 3 is going to take about an extra half of a playthrough in order to get the Platinum and 100%. Welcome to the Trophy and Achievement guide for the Legendary Edition version of Mass Effect 3! Just like the two previous games, this is a pretty straight forward list.