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