Here is the full list of all 33 Voodoo Garden achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
reach voodoo level 20
own 1 000 000 gold
sacrifice 11 animals
plant 10 herbs
sell 3 herbs
own 100 000 gold
sell 5 shrubs
collect 444 beenests
erect 7 totems
produce 1000 items
reach voodoo level 10
scare 88 bats
own 10 000 gold
collect 69 froglegs
produce 100 items
click crocodile 30 times
click skull 10 times
collect 2000 dragonflywings
collect 666 lizardtails
collect 6666 mushrooms
collect 3333 roots
collect 1234 snailhouses
collect 999 snaketeeth
expand garden 10 times
expand garden 20 times
free 3 spirits
plant 15 shrubs
plant 20 trees
produce 10 000 items
produce 240 voodoo dolls
restart game
sell 7 trees
reach voodoo level 30