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