Here is the full list of all 28 Harvest Moon: Light of Hope achievements.
Propose marriage to someone.
Reach the bottom of the mine.
Become more than friends with someone.
Place the last stone tablet by the lighthouse and revive the island.
Become a good friend with someone.
Mine all gems and ore.
Become closer to a friend.
Make strawberry jam and revive the Harvest Goddess.
Place four stone tablets by the lighthouse.
Become friends with someone.
Place three stone tablets by the lighthouse.
Get a fishing rod to catch fish.
Get a hammer to break rocks and mine ore.
Place the first stone tablet by the lighthouse.
Get an axe to cut down trees.
Place two stone tablets by the lighthouse.
Learn the basics of farming.
Unlock all achievements.
Catch all fish.
Harvest all crops.
Harvest all flowers.
Cook all recipes.
Record all items in the encyclopedia.
Win the Cooking Festival, Fishing Festival, and Dog Race on Advanced.
Get married to someone.
Have a child.
Using medicine, cure your child from Petrifaction.
Have your child grow up.