Here is the full list of all 58 Null & Peta -Invasion of the Queen Bug- achievements.
Clear Normal Mode (STAGE 9).
Clear Hard Mode (STAGE 9).
Reach the highest possible maximum HP.
Find all Event Objects in the West Coast.
Find all Key Items.
Obtain the Level 3 Chainsaw.
Obtain the Level 3 Gatling.
Clear Hell Mode (STAGE 9).
Unlock all CGs in the game.
Defeated Alcyone.
Defeated Alcyone without taking any damage.
Obtain the Level 3 Cannon.
Obtain the Level 3 Hammer.
Find all Event Objects in East Asia
Defeated Maia.
Defeated Maia without taking any damage.
Obtain the Level 3 Spanner.
Activate Peta Robo Mode 100 times.
Eat Extra Large Dark Fried Rice 25 times.
Eat Dark Fried Rice 50 times.
Fix 500 bugs.
Activate Petavity 100 times.
Obtain the Rare Metal Rain Boots.
Defeated the Queen Bug without taking any damage.
Activate Peta Robo Mode 50 times.
Defeated the Queen Bug.
Defeated Atlas.
Defeated Atlas without taking any damage.
Find all Event Objects in Africa.
Activate Petavity 50 times.
Obtain the Level 2 Cannon.
Obtain the Ultra-Quantum Goggles.
Obtain the Level 2 Chainsaw.
Defeated Merope.
Defeated Merope without taking any damage.
Find all Event Objects in the Amazon.
Obtain the Metal Rain Boots.
Defeated Taygeta without taking any damage.
Defeated Pleione without taking any damage.
Obtain the Level 2 Gatling.
Defeated Elektra.
Defeated Elektra without taking any damage.
Find all Event Objects in the Ancient Ruins.
Obtain the Level 2 Hammer.
Obtain the Level 2 Spanner.
Obtain the Level 1 Cannon.
Obtain the Chrome Rain Boots.
Fix 100 bugs.
Defeated Taygeta.
Obtain the Level 1 Hammer.
Obtain the Level 1 Chainsaw.
Find all Event Objects in Siberia.
Obtain the Gloves of the Yokozuna.
Obtain the Control Band.
Defeated Pleione.
Obtain the Level 1 Gatling.
Find all Event Objects in Akiba.
Make Dark Fried Rice.