Here is the full list of all 45 Heart'n Block achievements.
You destroyed your very first block!
Destroy 100 blocks
Destroy 1000 blocks
Destroy 10000 Blocks
Destroy 100000 blocks
Meet the girls at stage 1
Meet the girl at stage 5
Meet the girls at stage 8
Well...
Meet the girl at stage 15
Meet the girl at stage 20
Meet the girl at stage 25
Meet the girl at stage 30
Meet the girl at stage 35
Meet the girl at stage 40
Meet the girl at stage 45
Meet the girl at stage 50
Meet the girl at stage 55
Meet the girl at stage 60
Meet the girl at stage 65
Meet the girl at stage 70
Meet the girl at stage 75
Meet the girl at stage 80
Meet the girl at stage 85
Meet the girl at stage 90
Complete stage 100
Complete your first stage
Complete 50 stages
Complete 100 stages
Complete 200 stages
Get 1 perfect rating
Get 20 perfect ratings
Get 50 perfect ratings
Get 100 perfect ratings
Create a stage with the editor
Share a created stage on the workshop
Spin so fast that several images of the platform is visible
Destroy an invisible block with a laser
Avoid getting pulled by the chaos girl
Accumulate score worth of 7 digits
Accumulate score worth of 8 digits
Accumulate score worth of 9 digits
Make a chain of 10 or more
Make a chain of 50 or more
Make a chain of 99 or more