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