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.
Acquire each Hunter subclass.
Acquire each Titan subclass.
Complete 30 challenges.
Collect 15 Red War exotic weapons or armor.
Encounter an Agent of the Nine somewhere in the system.
Complete Introduction: Crucible.
Complete a Nightfall strike.
Complete a Flashpoint on Earth, Titan, Nessus, or Io.
Acquire each Warlock subclass.
Complete a Heroic public event.
Reach level 20.
Complete the Leviathan raid on Prestige difficulty.
Complete a Triumph Seal.
Pursue Uldren and the Fanatic to the Watchtower, and finish what you started.
Complete a Collections Badge.
Complete a Forsaken Exotic Quest.
Collect 10 Forsaken Exotic weapons or armor.
Defeat a Forsaken Nightfall Boss.
Win a Gambit match.
Earn 5,000 Triumph points.
Enter the Dreaming City.
Complete the "Last Wish" Raid.