Hi
With this solution you will get the following 17 achievements very easy:
-Day C
Survive Day 100.
-Day XC
Survive Day 90.
-Day LXXX
Survive Day 80.
-Day LXX
Survive Day 70.
-Day LX
Survive Day 60.
-Day L
Survive Day 50.
-Day XLV
Survive Day 45.
-Day XL
Survive Day 40.
-For Five Days...
For five days you didn't kill anything.
-Day XXXV
Survive Day 35.
-Day XXX
Survive Day 30.
-Day XXV
Survive Day 25.
-Day XX
Survive Day 20.
-Day XV
Survive Day 15.
-Day X
Survive Day 10.
-Day V
Survive Day 5.
-On The Ninth Day…
Until the ninth day you never galloped.
Ok, lets go, start the game, press A to avoid tutorial, turn left and start walking to the left, DONT gallop, just walk.
When you reach the end of the screen if you see the monster's cave (portal) just start over, if you reach the dock,
stay about three horses right of the lamp and STOP there, dont move for 6 hours and 40 minutes and you will get the 17 achievements.
Dont worry if monsters come or if you lost your crown, just DONT MOVE. If the crown fall to water and you must stay a bit right the next time.
Make sure you have the controller connected with to avoid the automatic desconnection with batteries.
Sorry about my english, iam from Spain. Enjoy and thx for read.