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