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