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