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.
Unlock all caches watched over by ancient statues.
Progress the story to unlock.
Find all of the wearable items that make up the Taken Shape.
Impress the Avvar of Stone-Bear Hold and gain their friendship.
Dispel a myth of ancient days.
Destroy all the Winter Shards and light all the fires in the Old Temple.
Uncover the secrets of a legendary figure.
Rest Easy trial always on in Emprise du Lion: claim Suledin Keep.
Fair-Weather Friends always on: enter Halamshiral with all followers.
Acquire 10 Inquisition agents in a single playthrough.
Take It Slow on: reach Skyhold at level 5 or less.
Travel Light on for "In Hushed Whispers": finish the quest.
Enter the heart of the Solasan temple.
End the earthquakes threatening the surface.
Help Shaper Valta discover secret dwarven history.
Slay 10 high dragons in single-player mode.
Rub Some Dirt on It on: slay the Hivernal high dragon.
Defeat 20 foes promoted by Walk Softly.
Slay 10 great bears promoted by Grizzly End.
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.
Upgrade your alchemic potions, grenades, or tonics 30 times in a single playthrough.
Even Ground on: slay a level 16 or higher Fereldan Frostback.
Seal 75 rifts in a single playthrough.
Recruit a powerful ally to even the score.
Kill a high dragon in single-player mode.
Discover a campsite and establish at least one Inquisition camp in 10 wilderness areas.
Craft an item from Tier 4 materials in all non-masterwork slots in single-player mode.
Unlock 15 astrariums in a single playthrough.
Reach level 20 in single-player mode.
Defeat 1,000 demons in single-player mode.
Become friends with at least three of your inner circle in one playthrough.
Purchase any new decoration element for Skyhold.
Reach an ancient ruin before your enemies.
Earn 50,000 or more gold across all single-player playthroughs.
Liberate three keeps in a single playthrough.
Commit to a romantic relationship.
Choose a specialization class.
Make an impression on the Orlesian court.
Gain the full approval of the Orlesian court.
Defeat 2,500 enemies in single-player mode.
Complete 20 requisition requests in a single playthrough.
Level up the Inquisition to rank 10.
Harvest 50 herbs from Skyhold's garden in a single playthrough.
Face your fears in the Fade.
Completely upgrade one throne.
Complete 50 missions or operations in a single playthrough.
Complete a mission at the expedition table in the Legion of the Dead camp.
Defeat an ogre alpha.
Purchase or secure five different mounts of any kind.
Collect 250 codex entries in a single playthrough.
Survive an attack on the Inquisition.
Recruit all possible companions in a single playthrough.
Land a single blow in excess of 1,000 damage in single-player mode.
Close the Breach.
Spend 10 points in a single ability tree with any one single-player character.
Craft a weapon or piece of armor in single-player mode.
Discover a veilfire rune.
Recruit a new companion.
Enchant or upgrade a piece of equipment in single-player mode.
Gain access to a major city for the Inquisition.
Complete a timed mission on the war table.
Secure a mount.
Discover a campsite and establish an Inquisition camp in any wilderness area.
Find and recover a shard identified by an ocularum.
Upgrade any ability once in single-player mode.
Finish the prologue.
Trigger a cross-class combo with a character you control in single-player mode.