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