Here is the full list of all 20 Sir Lovelot achievements.
Collect 50 geese
Unearth a secret treasure
Revisit a level
Pickup 100 coins
Defeat 100 nasties
Find 5 diamonds
Visit Spookyland
Collect 3 lollipops
Visit Volcanoland
Collect 40 daisies
Defeat the fire spitting Dragon
Meet your one and only
Die 100 deaths
Visit Swampland
Take the plunge
Take a break
A flower for a damsel
Visit Jungleland
Break something
Finish a level without dying