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