Full list of all 41 Dark Souls achievements worth 1,000 gamerscore. It takes around 80-100 hours to unlock all of the achievements on Xbox 360.
Acquire all rare weapons.
Acquire all sorceries.
Acquire all pyromancies.
Acquire all miracles.
Acquire best weapon through standard reinforcement.
Acquire best weapon through crystal reinforcement.
Acquire best weapon through magic reinforcement.
Acquire best weapon through enchanted reinforcement.
Acquire best weapon through divine reinforcement.
Acquire best weapon through occult reinforcement.
Acquire best weapon through fire reinforcement.
All achievements completed. Congratulations!
Acquire best weapon through chaos reinforcement.
Reach "The Dark Lord" ending.
Discover Blade of the Darkmoon covenant.
Discover Darkwraith covenant.
Acquire the Art of Abysswalking.
Defeat the Four Kings, inheritors of souls.
Defeat Dark Sun Gwyndolin, the Darkmoon God.
Acquire the Lordvessel.
Arrive in Anor Londo.
Acquire best weapon through lightning reinforcement.
Reach "To Link the Fire" ending.
Defeat the Soul Lord Bed of Chaos.
Defeat the Soul Lord Gravelord Nito.
Acquire the Rite of Kindling.
Discover Gravelord Servant covenant.
Discover Princess's Guard covenant.
Defeat Seath the Scaleless, inheritors of souls.
Acquire best weapon through raw reinforcement.
Discover Forest Hunter covenant.
Defeat Crossbreed Priscilla, the Lifehunter.
Discover Warrior of Sunlight covenant.
Discover Path of the Dragon covenant.
Discover Chaos Servant covenant.
Ring Bell of Awakening in Quelaag's domain.
Ring Bell of Awakening at Undead Church.
Discover Way of White covenant.
Arrive in Lordran.
Acquire Estus Flask.
Light bonfire flame.