Bridge Builder (Bronze): Build 100 bridges.

Can you dig it (Bronze): Set off 100 digger Lemmings.

Fabulously Fun (Bronze): Complete all Fun levels.

Lemmie See Some Speed (Bronze): Complete Teach me Climbers and Floaters in under one minute.

Lemmie See Speed (Bronze): Beat 3rd Time Lucky in under 1 minute 30 seconds.

Lemming Exploder (Bronze): Blow up 100 Lemmings.

Lemming Leader (Gold): Save every Lemming possible.

Lethal Lemmings (Silver): Send 1000 Lemmings to their death.

Mayhem Master (Silver): Complete all Mayhem levels.

The Ultimate Clone (Bronze): Make a clone that can float and climb.

Tricky but not Taxing (Bronze): Complete all Tricky levels.

Triumphantly Taxing (Silver): Complete all Taxing levels.