Here is the full list of all 100 Picayune Dreams achievements.
Complete Weapon collection.
RIP.
Upgrade the Wicked Walkman to Level 8.
Enable Debug Mode.
Upgrade the Energizing Battery to Level 8.
Upgrade the IV Bag to Level 8.
Beat Overdrive 4.
Beat a run with 200%+ Projectile Speed.
Upgrade the Pleonexic Crown to Level 8.
Upgrade the Angel Wings to Level 8.
Defeat Yuki.
Kill 500,000 enemies.
Upgrade the Shinobi Equipment to Level 8.
Upgrade the Hydrocillator to Level 8.
Upgrade the Plasma Lamp to Level 8.
Upgrade the Defense Turret to Level 8.
Upgrade the Overcharged Engine to Level 8.
Upgrade the Electric Eel to Level 8.
Upgrade the Shrapnel Shells to Level 8.
Beat Overdrive 3.
Beat a run with 200%+ Velocity.
Defeat the Ghost.
Upgrade 1000 times.
Upgrade the Eye2 to Level 8.
Upgrade the Frost Globe to Level 8.
Upgrade the Digiwatch to Level 8.
Upgrade the Frosty Cone to Level 8.
Upgrade the Telecom to Level 8.
Upgrade the Ultrabuster to Level 8.
Beat Overdrive 2.
Upgrade the Soul Spear to Level 8.
Reach Skill Level 20.
Upgrade the Injection to Level 8.
Upgrade the Legsaw to Level 8.
Upgrade the Missile Pack to Level 8.
Upgrade the Horns to Level 8.
Upgrade the Flame Thrower to Level 8.
Upgrade the Fire Lighter to Level 8.
Upgrade the Slime Spike to Level 8.
Reach Skill Level 25.
Beat Overdrive 1.
Beat a run with 200%+ Attack Size.
Upgrade the Hunter's Bow to Level 8.
Kill 25 Bosses.
Upgrade 500 times.
Kill 100,000 enemies.
Upgrade the Volatile C4 to Level 8.
See all of the memories.
Kill 50,000 enemies.
Reach Skill Level 15.
Upgrade the Dagger Glove to Level 8.
Upgrade the Mask of Plague to Level 8.
Upgrade the Static Satellite to Level 8.
Upgrade the Strike Call to Level 8.
Beat the game.
Beat a run without using Halos or IVBags.
Beat a run without upgrading CORE.
Beat a run with 200%+ Vitality.
Defeat Picayune.
Defeat the Demon.
Find 10 Drills.
Find 10 Chain Grenades.
Upgrade the Chainbelt to Level 8.
Defeat the Biker
Kill the Worm without splitting it.
Kill 25,000 enemies.
Reach Skill Level 10.
Find 10 Blackholes.
Find 10 Floppies.
Upgrade 100 times.
Find 10 Magnets.
Find 10 HP Vials.
Kill 10,000 enemies.
Reach Skill Level 5.
Upgrade the CORE to Level 8.
Upgrade the Parasight to Level 8.
Defeat the Worm.
Die.
Defeat the Bunny.
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See the true ending.
Beat the game with Slime Spike, Chainbelt, LegSaw and Hydrocillator.
Beat the game with Core, UltraBuster, Eye2 and Hunter's Bow.
Beat Overdrive 5.
Complete Enemy collection.
Kill 1,000,000 enemies.
Reach 30 Mortality.
Reach 40 Mortality.
Reach 50 Mortality.
Find 10 Dice.
Upgrade the Yoyo Rack to Level 8.
Upgrade the Halo to Level 8.
Upgrade the Demon Wings to Level 8.
Upgrade the Element Crystal to Level 8.
Beat a Daily.
Beat a run without using auto-aim.
I brought you a head.
Beat a run with 200%+ Pickup Size.
Beat a run with 10+ Blackhole Slots.
Beat the game without being hit by an enemy or boss or bullet.