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