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