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