Here is the full list of all 59 Brutal Legend achievements. It takes around 35-40 hours to unlock all of the achievements on Windows.
Win 50 match-made multiplayer battles.
Hit 6 enemies with the explosion from a Brood's Double Team
Kill 20 enemies with one Bleeding Death
Win 10 games on Hammer of Infinite Fate maps - ranked or vs. the Brütal AI.
Spend 250,000 fans - any mode
Hit 15 enemies with one Agony Ball using the Pain Lifter's Double Team
Win an AI stage battle - Brütal difficulty
Win 10 match-made multiplayer battles.
Kill 25 enemies with the grinder of one Rock Crusher
Achieve 100% completion on the stats screen
Unlock all songs in the Mouth of Metal
Kill 20 Tainted Coil units with the Disgorger.
Win a ranked multiplayer match
Play with or against another player who has this Achievement
Play a multiplayer game on all Hammer of Infinite Fate multiplayer maps.
Win a single-player Stage Battle against the AI using only orders
Double Team with every Tainted Coil unit
Double Team with every Drowning Doom unit
Kill 20 Drowning Doom units with the Eye of Sorrow.
Visit the grave of a fallen hero while wearing the Black Metal Threads.
Make out with Ophelia while wearing the Mountain Man Threads.
View all Legends
Ride a Razorfire Boar into the Sea of Black Tears and live to tell the tale.
Complete Campaign mode on Gentle
Complete Campaign mode on Normal
Complete Campaign mode on Brütal
Complete "Sea of Black Tears"
Kill 15 enemies with a Metal Beast while wearing the Zaulia Threads.
Purchase all upgrades in the Motor Forge
Free all 120 Bound Serpents
View all vistas
Trap 15 enemies in one ring of fire with the Fire Baron's Double Team
Acquire 3,000 Fire Tributes
Complete "Dry Ice, Wet Graves"
Ride one of every ridable animal.
Chisel four Razputin heads onto Mt. Rockmore.
Complete all hunting secondary missions
Kill a Tollusk using only Ground Urchins
Complete all racing secondary missions
Slay 150 enemies with the Deuce - any mode
Jump over a Hextadon in the Deuce
Win an AI stage battle - any difficulty
Double Team with every Ironheade unit
Learn all guitar solos
Summon all Motor Forges
Free 80 Bound Serpents
Run down 20 animals in the Deuce with the Coiling Maw equipped.
Complete 20 ambush, outpost defense, or mortar secondary missions
Complete "It's Raining Death"
Complete "Sanctuary of Sin"
Personally smote 300 enemies - any mode
Complete "Pilgrimage of Screams"
Free 40 Bound Serpents
Complete "Battle for Bladehenge"
Complete "Lair of the Metal Queen"
Purchase 1 upgrade in the Motor Forge
Gain 5 or more seconds of hang time in a single jump - any mode
Complete "Exploited in the Bowels of Hell"
Complete "Welcome to the Age of Metal"