ACHIEVEMENT - HOW TO UNLOCK An Apple a Day... - Complete Retro 6 without picking up a Health Crate. Can't Be Rocked - Complete Retro 4 without taking damage. Child's Play - Complete Retro 11 without the Toy Master taking damage. Crate Fishing - Collect all the crates on Retro 12. Last Worm Scout - Complete Retro 1 without the Mayor taking damage. Leave No Worm Behind - Complete Retro 10 with all 3 player worms alive. Modernist - Complete Retro 1-5. So Last Year - Complete Retro 6-10. Stuck in the 90s - Complete Retro 11-15. Worminator - Complete Retro 7 and kill all the enemy worms.