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