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