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