Here is the full list of unlockable achievements in Dark Souls for the Xbox 360.
There are fifteen secret achievements you can unlock at the bottom of this list.
Art of Abysswalking (15) – Acquire the Art of Abysswalking
Bond of a Pyromancer (25) – Acquire all pyromancies
Chaos Weapon (15) – Acquire best weapon through chaos reinforcement
Covenant: Chaos Servant (25) – Discover Chaos Servant covenant
Covenant: Gravelord Servant (25) – Discover Gravelord Servant covenant
Covenant: Way of White (15) – Discover Way of White covenant
Crystal Weapon (15) – Acquire best weapon through crystal reinforcement
Divine Weapon (15) – Acquire best weapon through divine reinforcement
Enchanted Weapon (15) – Acquire best weapon through enchanted reinforcement
Enkindle (15) – Light bonfire flame
Estus Flask (15) – Acquire Estus Flask
Fire Weapon (15) – Acquire best weapon through fire reinforcement
Knight’s Honor (25) – Acquire all rare weapons
Lightning Weapon (15) – Acquire best weapon through lightning reinforcement
Magic Weapon (15) – Acquire best weapon through magic reinforcement
Prayer of a Maiden (25) – Acquire all miracles
Raw Weapon (15) – Acquire best weapon through raw reinforcement
Reach Lordran (15) – Arrive in Lordran
Ring the Bell (Quelaag’s Domain) (15) – Ring Bell of Awakening in Quelaag’s domain
Ring the Bell (Undead Church) (15) – Ring Bell of Awakening at Undead Church
Rite of Kindling (15) – Acquire the Rite of Kindling
Strongest Weapon (15) – Acquire best weapon through standard reinforcement
The Dark Soul (50) – All achievements completed. Congratulations!
Wisdom of a Sage (25) – Acquire all sorceries
Here are the fifteen secret achievements you can unlock in the game.
Covenant: Blade of the Darkmoon (25) – Discover Blade of the Darkmoon covenant
Covenant: Chaos Servant (25) – Discover Chaos Servant covenant
Covenant: Darkwraith (25) – Discover Darkwraith covenant
Covenant: Forest Hunter (25) – Discover Forest Hunter covenant
Covenant: Gravelord Servant (25) – Discover Gravelord Servant covenant
Covenant: Path of the Dragon (25) – Discover Path of the Dragon covenant
Covenant: Princess’s Guard (25) – Discover Princess’s Guard covenant
Covenant: Warrior of Sunlight (25) – Discover Warrior of Sunlight covenant
Dark Lord (90) – Reach ‘The Dark Lord’ ending
Defeat Bed of Chaos (25) – Defeat the Soul Lord Bed of Chaos
Defeat Crossbreed Priscilla (25) – Defeat Crossbreed Priscilla, the Lifehunter
Defeat Gravelord Nito (25) – Defeat the Soul Lord Gravelord Nito
Defeat Seath the Scaleless (25) – Defeat Seath the Scaleless, inheritors of souls
Defeat the Dark Sun Gwyndolin (25) – Defeat Dark Sun Gwyndolin, the Darkmoon God
Defeat the Four Kings (25) – Defeat the Four Kings, inheritors of souls
Occult Weapon (15) – Acquire best weapon through occult reinforcement
To Link the Fire (90) – Reach ‘To Link the Fire’ ending