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