The solution start is the same as Radical Remix:
1. Press Y to bring up the Menu and then RB to access the online features.
2. Now select My Gallery.
3. Use the RB/LB buttons to find the EA Picks.
4. Choose a level that has the tree icon in the top left corner.
5. Press A and A again to view it.
6. Once the user created level has loaded click on Y and select Save Locally & Remix (bottom right icon)
7. Give it a name and save it.
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8. Press Y again and customise the level in some way. Add a sticker or objects.
9. Once changed, press Y and select Save Creation
10. Save it in your EA gallery and the achievement should unlock.