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