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