Complete Mild 7 "The Staircase" without any builders.
Complete Mild 13 "Take A Shortcut!" without any builders.
Complete Mild 30 "You Just Lost The Game!" without any floaters.
Save 100% on Wimpy 13 "A Magician Would Be Handy".
Complete Wimpy 22 "Fast Enough?" while keeping the release rate as low as possible.
Complete Wimpy 29 "Only One Place To Go" with two skills.
Complete Medi 7 "Leap of Faith" with two skills.
Complete Medi 16 "The Oddstack" within its old time limit (3 minutes).
Save 100% on Danger 12 "When Life Gives You Lemmings...".
Complete Danger 25 "Use The Pen!" without using any floaters.
Save 100% on Danger 29 "Pipeline Problem".
Save 100% on PSYCHO 16 "Crosswork".
Complete Wimpy 6 "Two Pathways" with only two skills.
Save 98% on Wimpy 17 "No Need To Worry!" with no more than one builder.
Complete Wimpy 25 "Down With The Lemmings" with no more than three builders.
Save 100% on Wimpy 30 "Counterlogical" without any floaters.
Complete Medi 23 "This Is..." in less than one minute.
Save 100% on Danger 4 "In The Life Of A Lemming...".
Complete Danger 30 "The Hideout" without assigning more than one skill to each lemming.
Complete PSYCHO 28 "To The End!" using only bashers and diggers.
Complete Wimpy 10 "Labyrinth of Despair" with no more than 3 of each skill.
Complete Medi 1 "Secret to Success" with no more than 4 builders and no more than 2 of each other skill.
Save 80% on Danger 9 "Wall of Wisdom".
Complete Danger 11 "The Warp Room" without assigning skills to more than one lemming.
Beat the final level (PSYCHO 30 "Hellfire!").