Here is the full list of all 34 Alkali achievements.
Complete the game in 1 hour or less
Obtain all achievments
Complete ending C: Comrades
Complete ending B: Breakout
Reach 500 mass in the campaign
Acquire all campaign diskettes
Complete all regular campaign levels
Unlock all journal entries
Travel 42 195 meters
Complete the Facility world
Complete ending A: Alkali
Die once to each hazard in the campaign
Reach 25 000 total score in the campaign
Plunge into water while electrically charged and on fire
Stay airborne for 10 seconds in a campaign level
Complete a custom level
Complete the Rainforest world
Spend 15 total minutes on fire
Complete a campaign level in 40 seconds or less
Destroy a Living Remnant
Unlock half of all journal entries
Spend 10 total minutes underwater
Complete the Ice Caves world
Find a glitched diskette in the campaign
Complete a campaign level without dying
Pick up 5000 metal chunks in the campaign
Spend 60 total minutes airborne
Complete a dark world level
Complete the Grand Mesa world
Unlock a journal entry
Enter a secret portal
Reach four times maximum running velocity
Complete the tutorial
Die from dashing or double jumping