Here is the full list of all 35 Valfaris achievements.
Defeat the Junk Gargoyle.
Upgrade a weapon for the first time.
Die for the first time.
Defeat the Bloodstalker Queen.
Defeat the Exterminator.
Defeat Lord Jylskel.
Defeat Itnan.
Defeat the Ironclad Desolator.
Defeat Furrok.
Defeat Hydravok.
Die 50 times.
Destroy 60 crates in a single playthrough.
Destroy 70 lights in a single playthrough.
Slash and destroy 40 projectiles in a single playthrough.
Hit an enemy with a Shield Counter-Blast 25 times in a single playthrough.
Parry an enemy melee attack 15 times in a single playthrough.
Kill 1000 enemies in a single playthrough.
Exchange 15 Resurrection Idols for Blood Metals in a single playthrough.
Upgrade 10 different weapons at least once in a single playthrough.
Fully upgrade a pistol weapon.
Fully upgrade a destroyer weapon.
Fully upgrade a melee weapon.
Drop the wrecking ball on the Junk Gargoyle.
Kill all 8 leaping Swamp Worms in the Eco-Dome.
Kill 10 Hive Workers by reflecting their gunk balls back at them in a single life.
Destroy all 9 Tetra Sentries in the Power Chambers in a single life.
Motivate a Stone Worm in the Worm Tunnels 10 times during a single ride.
Kill Furrok by delivering the final blow with his own flaming hammers.
Parry Hydravok’s heads 3 times in a single life.
Find every weapon.
Discover every secret area.
Finish the Landing Pad without activating any checkpoints.
Complete the game in under 2 hours.
Finish the game with 10 or fewer deaths.
Finish the game in Full Metal Mode.