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