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