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