Here is the full list of all 26 Lightyear Frontier achievements.
Plant 1000 seeds.
Feed 50 animals.
Explore 7 ruins.
Explore the vault in Outset Grasslands.
Increase Homestead Coziness to 3.
Restore all regions in Outset Grasslands.
Remove 700 Noxious Weeds.
Plant 500 seeds.
Feed 20 animals.
Remove 150 Noxious Slimes.
Get 10 upgrades at the Upgrade Depot.
Build the radio tower.
Remove 300 Noxious Weeds.
Plant 100 seeds.
Increase Homestead Coziness to 2.
Remove 50 Noxious Slimes.
Get an upgrade at the Upgrade Depot.
Feed an animal for the first time.
Remove 100 Noxious Weeds.
Increase Homestead Coziness to 1.
Plant your first seed.
Explore a ruin.
Scare away 10 animals.
Restore a region.
Remove 10 Noxious Slimes.
Spray water at another player.