Here is the full list of all 23 Dogolrax achievements.
Complete the 6th Bonus stage.
Reach this chapter
Complete the 4th Bonus stage.
Reach this dream
Complete the 10th Bonus stage.
Complete the 9th Bonus stage.
Complete the 5th Bonus stage.
Complete the 2nd Bonus stage.
Complete the 3rd Bonus stage.
Complete the 1st Bonus stage.
Complete the 8th Bonus stage.
Can you figure this one out?