Full list of all 65 Dragon Age II achievements worth 1,370 gamerscore. It takes around 60-80 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 15 achievements worth 370 Gamerscore.
Found every variety of crafting resources.
Defeated Meredith, knight-commander of Kirkwall's templars.
Found and killed a high dragon.
Reached Level 20.
Completed a romance with one of your party members.
Completed Dragon Age II.
Completed Dragon Age II twice, or completed it once with a save imported from Dragon Age Origins.
Became the viscount of Kirkwall.
During each year in Kirkwall, discovered 3 secret messages from the Band of Three.
Crafted all of the items from a single crafting tree.
Sided with the templars five times.
Found all four chapters of "The History of the Chantry," by Brother Genitivi.
Found and killed the undying Xebenkeck.
Earned the rivalry of one of your party members.
Reached Kirkwall with each character class across multiple playthroughs.
Allied yourself with the mercenaries upon arriving in Kirkwall.
Found and killed the ancient demon, Hybris.
Sided with the mages five times.
Completely upgraded the armor of one of your party members.
Defeated the Arishok.
Met Grand Cleric Elthina, Viscount Dumar, Knight-Commander Meredith, and First Enchanter Orsino.
Earned the Arishok's respect.
Earned the friendship or rivalry of four party members.
Found and killed a varterral.
Visited 10 caves in Kirkwall and the surrounding area.
Learned two class specializations.
Flirted with one of your party members to begin a romance.
Had 100 or more sovereigns in your purse.
Completed a full year in Kirkwall without any party member being knocked unconscious.
Defeated the rock wraith on your expedition into the Deep Roads.
Explored the Deep Roads.
Enchanted an item.
Became a partner in a Deep Roads expedition.
Mastered a weapon style.
Used teamwork to perform a cross-class combo.
Reached Level 10.
Recruited four party members.
Unlocked 100 codex entries.
Opened 50 chests.
Left Kirkwall to explore the outlying regions.
Gave a gift to one of your party members.
Earned the friendship of one of your party members.
Kicked the slavers out of your ancestral mansion.
Upgraded the armor of one of your party members.
Toggled the map from day to night.
Acquired your first crafting recipe.
Became a resident of Kirkwall.
Upgraded a spell or talent.
Allied yourself with the smugglers upon arriving in Kirkwall.
Listened to Varric begin his tale of the Champion of Kirkwall.
Met secretly with the agent of the Divine
Earned either a friendship or rivalry with Sebastian.
Gave Sebastian a family heirloom.
Confronted the culprit behind the Vael family's murder.
Dealt with the mercenaries that killed the Vael family.
Completed the main quest in the Vimmark Mountains with Bethany or Carver in the party.
Defeated an ancient evil in the Vimmark Mountains.
Applied three effects to Hawke's Key.
Completed every side quest in the Vimmark Mountains prison tower.
Killed a genlock, genlock alpha, hurlock alpha, bronto, and deepstalker in the Vimmark Mountains.
Disarmed the fire traps in Chateau Haine's vaults.
Defeated Duke Prosper, with or without Tallis.
Evaded vault security in Chateau Haine.
Lured and killed an alpha wyvern near Chateau Haine.
Tallis joined the party.