Here is the full list of all 43 Battlepillars achievements.
Defeat 2 bosses within 30 seconds in Endless mode
Complete every Gold Challenge and unlock the Gold skin
Defeat General Battlepillar 20X7 on the Moon
Earn 5,000 apples
Complete 50 Gold Challenges
Unlock every skin in the Upgrade store
Unlock all segments in the Upgrade store
Complete the single-player campaign
Unlock Endless Mode
Defeat General Battlepillar 20X7 in Campaign Mode
Kill 1,000 enemy caterpillars
Complete 40 Gold Challenges
Defeat Geraldine the Scrap Queen in Campaign Mode
Kill 50 spiders
Complete 30 Gold Challenges
Fully upgrade your base
Defeat Frankenpillar in Campaign Mode
Complete 20 Gold Challenges
Unlock the Test Zone
Defeat Lieutenant Tikki-Tavi in Campaign Mode
Complete 10 Gold Challenges
Beat a level using only single segment caterpillars
Keep your first deployed Battlepillar alive for the duration of a battle
Beat a level using only one type of segment
Defeat Sergeant Flowerpuff in Campaign Mode
Purchase your first segment upgrade
Kill 100 enemy caterpillars
Use Larry the Bird for the first time
Beat a level after your base has taken damage
Complete your first Gold Challenge
Build your first 7 segment caterpillar
Complete the tutorial and beat the first stage
Build a developer Battlepillar
I didn't choose the bug life. The bug life chose me.
Win your first multiplayer match
Use an ally in a multiplayer match
Play an invite-only match with a Steam friend
Win a multiplayer match in under a minute
Make your multiplayer opponent concede defeat
Win a multiplayer match while at a disadvantage
Defeat General Battlepillar 20X7 in Endless mode
Earn 1,000,000 points in Hardcore Endless mode
Win 3 matches in a row during a single multiplayer session