Full list of all 76 Dragon Age: Origins achievements worth 1,750 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 8 DLC packs containing 26 achievements worth 750 Gamerscore.
Completed the Human Noble origin story
Completed the Dalish Elf origin story
Completed the City Elf origin story
Completed the Magi origin story
Completed the Dwarf Commoner origin story
Completed the Dwarf Noble origin story
Completed Ostagar
Used the Grey Warden treaties to recruit all possible allies
Completed "The Arl of Redcliffe"
Completed "The Landsmeet"
Complete 15 job-board quests
Across all playthroughs, recruited all party members
Across all playthroughs, experienced all possible romances
Across all playthroughs, discovered all possible endings
Used a tome to improve the main character's attributes, talents, spells, or skills
The ultimate sacrifice was made in defense of Ferelden
Defeated the Archdemon and, through a dark ritual with Morrigan, spared your own life
Sided with the mages in "Broken Circle"
Sided with the templars in "Broken Circle"
Sided with the werewolves in "Nature of the Beast"
Sided with the elves in "Nature of the Beast"
Sided with the Cult of Andraste in "The Urn Of Sacred Ashes"
Defied the Cult of Andraste in "The Urn of Sacred Ashes"
Sided with Bhelen in "A Paragon of Her Kind"
Sided with Harrowmont in "A Paragon of Her Kind"
Destroyed the Anvil of the Void
Preserved the Anvil of the Void
Main character inflicted 250 damage with a single hit
Completed an origin story without the main character ever falling in battle
Set foot in every area in the game
Main character achieved level 20 as a warrior
Main character achieved level 20 as a rogue
Main character achieved level 20 as a mage
Defeated the dragon guarding the Urn of Sacred Ashes
Completed a Chanter's Board quest
Killed 100 darkspawn
Killed 500 darkspawn
Killed 1000 darkspawn
Preserved the lives of half the troops at Denerim's Gates in "The Final Battle"
Crafted an item
Succeeded at five difficult Persuasion attempts
Succeeded at 25 difficult Persuasion attempts
Succeeded at five difficult Intimidate attempts
Succeeded at 10 difficult Intimidate attempts
Experienced the thrill of romance with Alistair
Experienced the thrill of romance with Morrigan
Experienced the thrill of romance with Zevran
Experienced the thrill of romance with Leliana
Main character learned a specialization
Main character learned two specializations
Completed "The Golem in Honnleath" (The Stone Prisoner DLC)
Completed "A Golem's Memories" (The Stone Prisoner DLC)
Defeated the ogre that killed King Cailan
Acquired all upgrades for Vigil's Keep
Destroyed the broodmothers in Kal'Hirol
Escaped the silverite mines
Defeated the baroness
Saved the city of Amaranthine
Saved Vigil's Keep
Completed Dragon Age: Origins - Awakening
Reached level 30
Handed victory to the archdemon by killing Ferelden's last Grey Warden. (Darkspawn Chronicles)
Earned maximum approval from all thrall types. (Darkspawn Chronicles)
Keep the initial ogre alive as your thrall throughout the entire module. (Darkspawn Chronicles)
Collected and assembled the Battledress of the Provocateur.
Heard Leliana's version of her betrayal.
Destroyed the career of Guard Captain Eams.
Defeated the Harvester
Defeated the Harvester on Hard or Nightmare difficulty
Gathered all of the research notes in Amgarrak
Defeated the varterral on Hard or Nightmare difficulty
Completed "Witch Hunt"
Gathered the lost lore of Cadash Thaig
Completed the scrying ritual
Completed "Soldier's Peak" (Warden’s Keep DLC)
Took advantage of Avernus's research (Warden’s Keep DLC)