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