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