Here is the full list of all 35 Valfaris achievements.
Finish the Landing Pad without activating any checkpoints.
Defeat Hydravok.
Parry Hydravok’s heads 3 times in a single life.
Destroy 70 lights in a single playthrough.
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.
Upgrade 10 different weapons at least once in a single playthrough.
Destroy 60 crates in a single playthrough.
Fully upgrade a melee weapon.
Exchange 15 Resurrection Idols for Blood Metals in a single playthrough.
Defeat the Ironclad Desolator.
Fully upgrade a destroyer weapon.
Fully upgrade a pistol weapon.
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.
Defeat the Exterminator.
Kill 10 Hive Workers by reflecting their gunk balls back at them in a single life.
Hit an enemy with a Shield Counter-Blast 25 times in a single playthrough.
Defeat the Bloodstalker Queen.
Die 50 times.
Slash and destroy 40 projectiles in a single playthrough.
Kill all 8 leaping Swamp Worms in the Eco-Dome.
Defeat the Junk Gargoyle.
Drop the wrecking ball on the Junk Gargoyle.
Upgrade a weapon for the first time.
Die for the first time.
Complete the game in under 2 hours.
Finish the game with 10 or fewer deaths.
Finish the game in Full Metal Mode.