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