Here is the full list of all 22 Lonely Trip achievements.
Meet a normal brick.
Meet a rope.
Meet a jelly brick.
Meet a flower.
Meet a box.
Meet a lift.
Meet fireflies.
Meet an ice brick.
Meet a sand brick.
Meet a wind brick.
Finish world 1 : Lonely Forest.
Finish world 2 : Weeping Forest.
Finish world 3 : Sleeping Forest.
Finish world 4 : Coldest Glacier.
Finish world 5 : Desolated Land.
Finish world 6 : Silent Sky.
Die for stepping into a spike.
Die for falling form high.
Die for flying out of sky.
She dies because of you.
Die for 100 times.
Collect all the stars.