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