Here is the full list of all 22 1HEART achievements.
Listen to seven hidden tracks
Check all console commands
Play 1Heart for one hour
Find dissecting room in less then 2 hours
Listen to four hidden tracks
Open door leading to the church basement
Find half of the hidden hearts
Solve ancient ornament riddle
Solve hidden object puzzle without hint
Enter the church
Destroy all possible crates
Make 200 mouse clicks
Pass the river
Complete the tutorial
Kill sheep
Get to basement without hints
Make 2000 mouse clicks
Make 5000 mouse clicks
Check "The Pirate Bay" site in computer console
Find all hidden hearts in the game
Complete the game
Play 1Heart for more then three hours