Here is the full list of all 29 Longvinter achievements.
Kill a wild capercaillie
Chop down 100 trees
Plant a berry
Plant a seed of wheat
Get 20 000 in cash
Get 10 000 in cash
Place 50 items
Build a farming plot
Get 5 000 in cash
Build a fence
Equip a weapon
Place 10 items
Go to snow region
Equip satellite communicator
Equip a hat
Craft an item
Cook food
Build a tent
Get killed
Catch a fish
Join a world for the first time
Get a kill
Kill 10 players
Kill 100 players
Unlock all fishes from compendium tab
Unlock all feathers from compendium tab
Unlock all plants from compendium tab
Heal yourself to full health after your health drops down to 1
Have inventory filled with wood