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 150 Noxious Slimes.
Build the radio tower.
Remove 700 Noxious Weeds.
Remove 300 Noxious Weeds.
Increase Homestead Coziness to 3.
Get 10 upgrades at the Upgrade Depot.
Remove 50 Noxious Slimes.
Plant 1000 seeds.
Feed 50 animals.
Remove 100 Noxious Weeds.
Increase Homestead Coziness to 2.
Plant 500 seeds.
Get an upgrade at the Upgrade Depot.
Plant 100 seeds.
Feed 20 animals.
Explore a ruin.
Restore a region.
Remove 10 Noxious Slimes.
Feed an animal for the first time.
Increase Homestead Coziness to 1.
Plant your first seed.
Scare away 10 animals.