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