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