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