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