Here is the full list of all 35 Valfaris achievements.
Defeat Hydravok.
Parry Hydravok’s heads 3 times in a single life.
Upgrade 10 different weapons at least once in a single playthrough.
Fully upgrade a destroyer weapon.
Discover every secret area.
Find every weapon.
Defeat Furrok.
Kill Furrok by delivering the final blow with his own flaming hammers.
Parry an enemy melee attack 15 times in a single playthrough.
Fully upgrade a melee weapon.
Defeat the Ironclad Desolator.
Destroy 60 crates in a single playthrough.
Fully upgrade a pistol weapon.
Exchange 15 Resurrection Idols for Blood Metals in a single playthrough.
Motivate a Stone Worm in the Worm Tunnels 10 times during a single ride.
Defeat Itnan.
Defeat Lord Jylskel.
Kill 1000 enemies in a single playthrough.
Destroy all 9 Tetra Sentries in the Power Chambers in a single life.
Slash and destroy 40 projectiles in a single playthrough.
Defeat the Exterminator.
Die 50 times.
Kill 10 Hive Workers by reflecting their gunk balls back at them in a single life.
Defeat the Bloodstalker Queen.
Kill all 8 leaping Swamp Worms in the Eco-Dome.
Upgrade a weapon for the first time.
Defeat the Junk Gargoyle.
Drop the wrecking ball on the Junk Gargoyle.
Hit an enemy with a Shield Counter-Blast 25 times in a single playthrough.
Die for the first time.
Destroy 70 lights in a single playthrough.
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.