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