I completed all Goblin levels but didn't get the achievement

I completed all Goblin levels but didn't get the achievement

For the Get Those Goblins! and Get those other Goblins! achievements, you need to finish all Goblin levels in the single player campaign and earn 3 stars in every level.

If you feel like you have completed even the last levels, check the total amount of Stars in the top part of the Single Player map. To get the achievements, you have to get 3-stars from all levels, including the ones where the campaign path branches out.