Full list of all 42 Star Trek Online achievements worth 1,090 gamerscore. It takes around 200-300 hours to unlock all of the achievements in the base game.
The base game contains 36 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 6 achievements worth 90 Gamerscore.
Reached Level 60 with one character
Completed the Spectres story arc
Completed the Borg Advance story arc
Got Assimilated by the Borg
Completed the Breen Invasion story arc
Completed the Cardassian Struggle story arc
Reached Level 50 with one character
Reached Level 40 with one character
Completed the Romulan Mystery story arc
Reached Level 30 with one character
Completed the Wasteland story arc
Completed the Klingon War story arc
Reached Level 20 with one character
Reached Level 10 with one character
Completed a Tutorial
Complete the Vigilance story arc
Complete The Delta Quadrant story arc
Complete the Solanae Dyson Sphere story arc
Complete the Vengeance story arc
Complete the Warzone story arc
Complete the Fek'Ihri Return story arc
Complete The Iconian War story arc
Complete the In Shadows story arc
Complete the Allies story arc
Complete the New Romulus story arc
Complete the From the Ashes story arc
Complete the Empire story arc
Discover all the Solanae Dyson Sphere lore
Discover all the New Romulus lore
Discover all the Path to 2409 lore
Explore New Romulus
Explore Nimbus
Explore the Risa summer resort
Visit all the Vistas on Risa
Read all of the plaques on Starfleet Academy
Spend 30 points in any Captain Specialization
Completed the Yesterday's War story arc
Achieve Level 10 in one Admiralty campaign
Achieve Level 15 in one Research and Development school
Achieve Level 4 in any Duty Officer commendation track
Complete the Future Proof story arc
Complete the Agents of Yesterday story arc