Here is the full list of all 69 Dragon Age Inquisition achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Finish the single-player campaign on at least Hard without lowering the difficulty.
Finish the single-player campaign on Nightmare without lowering the difficulty.
Travel Light on for "In Hushed Whispers": finish the quest.
Take It Slow on: reach Skyhold at level 5 or less.
Unlock all caches watched over by ancient statues.
Rub Some Dirt on It on: slay the Hivernal high dragon.
Fair-Weather Friends always on: enter Halamshiral with all followers.
Gain the full approval of the Orlesian court.
Even Ground on: slay a level 16 or higher Fereldan Frostback.
Defeat 20 foes promoted by Walk Softly.
Rest Easy trial always on in Emprise du Lion: claim Suledin Keep.
Slay 10 great bears promoted by Grizzly End.
Destroy all the Winter Shards and light all the fires in the Old Temple.
Seal 75 rifts in a single playthrough.
Acquire 10 Inquisition agents in a single playthrough.
Complete 50 missions or operations in a single playthrough.
Liberate three keeps in a single playthrough.
Unlock 15 astrariums in a single playthrough.
Upgrade your alchemic potions, grenades, or tonics 30 times in a single playthrough.
Harvest 50 herbs from Skyhold's garden in a single playthrough.
Recruit a powerful ally to even the score.
Progress the story to unlock.
Find all of the wearable items that make up the Taken Shape.
End the threat once and for all.
Reach an ancient ruin before your enemies.
Complete 20 requisition requests in a single playthrough.
Collect 250 codex entries in a single playthrough.
Become friends with at least three of your inner circle in one playthrough.
Reach level 20 in single-player mode.
Kill a high dragon in single-player mode.
Discover a campsite and establish an Inquisition camp in any wilderness area.
Complete a timed mission on the war table.
Recruit all possible companions in a single playthrough.
Face your fears in the Fade.
Commit to a romantic relationship.
End the earthquakes threatening the surface.
Help Shaper Valta discover secret dwarven history.
Impress the Avvar of Stone-Bear Hold and gain their friendship.
Dispel a myth of ancient days.
Land a single blow in excess of 1,000 damage in single-player mode.
Uncover the secrets of a legendary figure.
Choose a specialization class.
Enter the heart of the Solasan temple.
Level up the Inquisition to rank 10.
Make an impression on the Orlesian court.
Purchase any new decoration element for Skyhold.
Complete a mission at the expedition table in the Legion of the Dead camp.
Defeat an ogre alpha.
Craft an item from Tier 4 materials in all non-masterwork slots in single-player mode.
Completely upgrade one throne.
Survive an attack on the Inquisition.
Close the Breach.
Slay 10 high dragons in single-player mode.
Purchase or secure five different mounts of any kind.
Secure a mount.
Discover a veilfire rune.
Spend 10 points in a single ability tree with any one single-player character.
Recruit a new companion.
Gain access to a major city for the Inquisition.
Craft a weapon or piece of armor in single-player mode.
Enchant or upgrade a piece of equipment in single-player mode.
Find and recover a shard identified by an ocularum.
Discover a campsite and establish at least one Inquisition camp in 10 wilderness areas.
Trigger a cross-class combo with a character you control in single-player mode.
Upgrade any ability once in single-player mode.
Finish the prologue.
Earn 50,000 or more gold across all single-player playthroughs.
Defeat 1,000 demons in single-player mode.
Defeat 2,500 enemies in single-player mode.