Here is the full list of all 38 Rebons achievements.
Pass 1 level of difficulty: easy
Pass 1 level from the first time
Pass 5 levels of difficulty: easy
Pass 10 levels on difficulty : hard
Pass 20 levels on difficulty : hard
Pass 40 levels on difficulty : hard
Pass 60 levels on difficulty : hard
Pass 1 level on difficulty : hard
Pass 5 level on difficulty : hard
Pass 10 level on difficulty : hard
Pass 1 level on gold
Pass 5 level on gold
Pass 10 level on gold
Pass 25 level on gold
Pass 55 levels on gold
Die 10 times
Die 100 times
Die 10000 times
Play with a friend on a speed of 1 times
Play with a friend on a speed of 5 times
Play with a friend on a speed of 10 times
Play with a friend on a speed of 50 times
Pass 1 level in co-op
Pass 5 level in co-op
Pass 10 level in co-op
Pass 20 level in co-op
Pass 40 level in co-op
Pass 60 level in co-op
Pass 5 level from the first time
Pass 10 level from the first time
Destroy 1 obstacle by a star
Destroy 10 obstacle by a star
Destroy 50 obstacle by a star
Destroy 100 obstacle by a star
Destroy 500 obstacle by a star