Here is the full list of all 23 Smalland: Survive the Wilds achievements.
Find the key for the walnut chest
Find the Witch, Tuhala
Glide for the first time
Meet with Nok
Collect a metal piece
Claim a tree
Collect silk
Collect bones
Tame any creature
Collect stone
Collect chitin
Sleep in a bed
Meet the Elder
Collect Pyrite
Meet the Historian
Meet the Merchant
Collect a Feather
Meet with Malik
Collect Icarus Wings
Meet with Granger
Collect Firesand
Meet with Sarnak
Collect a Snake Fang