Full list of all 36 Star Trek: Legacy achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
You saved all the refugee ships in "Anger and Mercy".
You protected the sensor relays from harm in "Revelations".
You destroyed 10 Federation ships in one online battle.
You destroyed 10 Romulan ships in one online battle.
You defeated 10 filthy Klingon vessels in a single online match.
You destroyed 10 Borg ships in one online battle.
You have completed the single player campaign on "Admiral" difficulty.
You have no name. You wear red. You're expendable.
You have completed the single player campaign on "Captain" difficulty.
You unlocked the USS Legacy, pride of the Mad Doc fleet!
You completed "Behind Enemy Lines" without being hit by enemy fire.
You stealthily completed "Ambush" without destroying any enemy warships.
You completed a mission in the Next Generation era with a fleet containing a Enterprise era ship
You destroyed the Borg abomination in "Omega" without neutralizing its support spheres.
All of the allied fleet survived the "At the Gates" mission.
You completed all objectives in "FireStorm".
You rescued the Proxima during "FireStorm".
You completed "Behind Enemy Lines" without cloaking like a lowly Targ.
You completed "The Squeeze" without destroying a single ship.
You captured all starbases in "The Squeeze".
You captured the Bird-Of-Prey without the help of any captured starbases.
You disabled at least 12 ships in "Stirring the Hive".
You kept the spore tally in "Poisoned Well" under 1000.
All of the medical ships in "Be My Shepherd" survived.
You have completed the single player campaign on Ensign difficulty.
You completed the Next Generation era without losing a single ship.
You completed "Logical Conclusions" without using the repair ship.
You completed "Generals" with at least one Klingon and one Romulan ship alive.
You destroyed a Borg cube during "Anger and Mercy".
You won your first battle against opponents.
You have completed all the missions in the Original Series era.
You completed the Original Series era without losing a single ship.
You delivered the killing blow to more than one ship with a single torpedo.
You completed the Enterprise era without losing a single ship.
You have completed all the missions in the Enterprise era.
By completing the tutorial mission, you have proven yourself as an officer of Starfleet.