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