Full list of all 23 Destiny 2 achievements. It takes around 200 hours to unlock all of the achievements in the base game on Windows.
The base game contains 13 achievements, and there is 1 DLC pack containing 10 achievements.
Complete the Leviathan raid on Prestige difficulty.
Acquire each Titan subclass.
Complete the Leviathan raid.
Acquire each Warlock subclass.
Encounter an Agent of the Nine somewhere in the system.
Complete Introduction: Crucible.
Complete a Flashpoint on Earth, Titan, Nessus, or Io.
Complete a Heroic public event.
Complete a Nightfall strike.
Collect 15 Red War exotic weapons or armor.
Complete 30 challenges.
Reach level 20.
Acquire each Hunter subclass.
Complete a Triumph Seal.
Complete the "Last Wish" Raid.
Complete a Collections Badge.
Collect 10 Forsaken Exotic weapons or armor.
Pursue Uldren and the Fanatic to the Watchtower, and finish what you started.
Complete a Forsaken Exotic Quest.
Enter the Dreaming City.
Defeat a Forsaken Nightfall Boss.
Win a Gambit match.
Earn 5,000 Triumph points.