Here is the full list of all 37 Cloudbuilt achievements.
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Complete Fog
Increase your life cap nine times
Complete Eclipse
Complete Rain
Complete Cloudbuilt
See all the endings
Collect all of Demi’s logs
Earn your first S-rank medal
Earn your first A-rank medal
Earn an A-rank on every level
Earn a S-rank on every level
Earn S-rank in every mode on every level
Increase your life cap to 316 lives
Swoosh through the intro level
That’s the next level over there!
Collected all extra lifes in the Fog branch
It's smaller than I imagined
Achieve A-rank on pathfinder mode in Ruins
Hug the mines!
Reach an ending from New Game without firing a single shot (except during tutorial)
Bring a stunned arachtoid with you for a while on your journey
The view from up in the garden is just wonderful
The top of the tower can never hurt you
Kill or stun 10 enemies in 5 seconds or less
Let the goal catch you
Complete ”Desire” (Defiance DLC)
Complete ”Desperation” (Defiance DLC)
Complete ”Nostalgia” (Defiance DLC)
Complete ”Expectations” (Defiance DLC)
Complete ”Chains” (Defiance DLC)
Complete “Nostalgia” without taking out any snipers (Defiance DLC)
“Fly” longer than 600 units after dying
Clear Full Game Defiance Rush mode without dying or restarting even once. If you can do this, you're not human... (Defiance DLC)
Enter the list of legendary players on the Full Game Defiance rush mode leaderboard! (Clear it once, no time constraint) (Defiance DLC)
Clear the Original 22 Rush Mode in 22:22 or less.
Clear the Fog Rush Mode without dying or restarting even once.