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