Here is the full list of all 35 Valfaris achievements.
Defeat Hydravok.
Parry Hydravok’s heads 3 times in a single life.
Defeat Furrok.
Kill Furrok by delivering the final blow with his own flaming hammers.
Fully upgrade a melee weapon.
Destroy 60 crates in a single playthrough.
Fully upgrade a pistol weapon.
Exchange 15 Resurrection Idols for Blood Metals in a single playthrough.
Defeat the Ironclad Desolator.
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.
Parry an enemy melee attack 15 times in a single playthrough.
Defeat the Exterminator.
Hit an enemy with a Shield Counter-Blast 25 times in a single playthrough.
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.
Slash and destroy 40 projectiles in a single playthrough.
Upgrade a weapon for the first time.
Defeat the Junk Gargoyle.
Die for the first time.
Destroy 70 lights in a single playthrough.
Upgrade 10 different weapons at least once in a single playthrough.
Fully upgrade a destroyer weapon.
Drop the wrecking ball on the Junk Gargoyle.
Destroy all 9 Tetra Sentries in the Power Chambers 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.