Here is the full list of all 43 Battlepillars achievements.
Defeat Sergeant Flowerpuff in Campaign Mode
Complete your first Gold Challenge
Build your first 7 segment caterpillar
Beat a level using only one type of segment
Keep your first deployed Battlepillar alive for the duration of a battle
Kill 100 enemy caterpillars
Beat a level after your base has taken damage
Use Larry the Bird for the first time
Purchase your first segment upgrade
Complete the tutorial and beat the first stage
Unlock the Test Zone
Unlock Endless Mode
Defeat Lieutenant Tikki-Tavi in Campaign Mode
Defeat Frankenpillar in Campaign Mode
Defeat Geraldine the Scrap Queen in Campaign Mode
Defeat General Battlepillar 20X7 in Campaign Mode
Defeat General Battlepillar 20X7 on the Moon
Complete the single-player campaign
Beat a level using only single segment caterpillars
Complete 10 Gold Challenges
Complete 20 Gold Challenges
Complete 30 Gold Challenges
Complete 40 Gold Challenges
Complete 50 Gold Challenges
Complete every Gold Challenge and unlock the Gold skin
Unlock every skin in the Upgrade store
Fully upgrade your base
Unlock all segments in the Upgrade store
Kill 50 spiders
Earn 5,000 apples
Kill 1,000 enemy caterpillars
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 2 bosses within 30 seconds in Endless mode
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