Here is the full list of all 110 School of Dragons achievements.
Win 50 challenges.
Win 25 challenges.
Win 10 challenges.
Win 5 challenges.
Get First Place in a Thunder Run race 30 times.
Get First Place in a Thunder Run race 20 times.
Get First Place in a Thunder Run race 10 times.
Play single player Thunder Run Racing 50 times.
Play single player Thunder Run Racing 30 times.
Win your first challenge.
Make 50 friends.
Make 20 friends.
Make 10 friends.
Visit 150 different friends.
Make 5 friends.
Visit 100 different friends.
Join a Clan.
Get First Place in a Thunder Run race 5 times.
Visit 75 different friends.
Visit 50 different friends.
Visit 40 different friends.
Make 1 friend.
Play Fireball Frenzy 40 times.
Play Fireball Frenzy 25 times.
Play Fireball Frenzy 15 times.
Play single player Thunder Run Racing 20 times.
Collect 60 sheep.
Get an A+ on 3 Meatlug lessons.
Get an A+ on 3 Groundsplitter lessons.
Catch 100 eel.
Catch 250 fish.
Catch 50 eel.
Catch 100 salmon.
Catch 150 fish.
Catch 25 eel.
Catch 50 salmon.
Catch 100 fish.
Catch 25 salmon.
Play single player Thunder Run Racing 10 times.
Collect 30 sheep.
Visit 25 different friends.
Get an A+ on 5 Night Fury lessons.
Visit 15 different friends.
Visit 10 different friends.
Visit a friend for the first time.
Shear sheep 100 times.
Shear black sheep 100 times.
Harvest 300 pumpkins.
Harvest 150 pumpkins.
Harvest 90 pumpkins.
Harvest 30 pumpkins.
Visit 40 different farms.
Visit 25 different farms.
Visit 15 different farms.
Play Fireball Frenzy 5 times.
Visit 10 different farms.
Catch 10 eel.
Feed your dragon 100 fish.
Feed your dragon 75 fish.
Collect 300 chicken eggs.
Shear sheep 50 times.
Shear black sheep 50 times.
Catch 50 fish.
Collect 150 chicken eggs.
Shear black sheep 25 times.
Shear sheep 25 times.
Feed your dragon 50 fish.
Feed your dragon 25 fish.
Collect 15 sheep.
Create your own Clan.
Buy 50 decorations for your farm.
Buy 30 decorations for your farm.
Buy 15 decorations for your farm.
Buy 5 decorations for your farm.
Collect 75 chicken eggs.
Harvest corn 150 times.
Catch 10 salmon.
Shear sheep 10 times.
Shear black sheep 10 times.
Collect 5 sheep.
Play single player Thunder Run Racing for the first time.
Harvest corn 75 times.
Harvest corn 45 times.
Collect 15 chicken eggs.
Harvest corn 15 times.
Harvest 100 dragon nip.
Harvest 50 dragon nip.
Harvest 30 dragon nip.
Harvest 10 dragon nip.
Catch a fish for the first time.
Get 25 A+'s in Flight Club.
Get 20 A+'s in Flight Club.
Complete 25 different Flight Club lessons.
Complete 20 different Flight Club lessons.
Complete 15 different Flight Club lessons.
Get 10 A+'s in Flight Club.
Complete 10 different Flight Club lessons.
Get 5 A+'s in Flight Club.
Get an A+ in Flight Club.
Complete a Flight Club lesson for the first time.
Play Fireball Frenzy for the first time.
Fly with Toothless.
Play with your dragon 10 times.
Play with your dragon 25 times.
Play with your dragon 50 times.
Play with your dragon 75 times.
Visit 10 different Vikings' About Me pages.
Visit 20 different Vikings' About Me pages.
Visit 30 different Vikings' About Me pages.
Visit 50 different Vikings' About Me pages.