I'm a few hours into the game, and I read through the achievement list. Do you get a S-rank in this game by basically finishing the game including sidequests?
Yeah do everything and then grind a little to get the last level. Pretty easy S-Rank.
Here's some advice on speeding up the grinding at the end. Set the difficulty to hard and then use the outhouses to teleport back and forth between the Unicorn Meadow and the lord's castle bridge. Clear out one area and then go back to the other and it should be repopulated. If at some point they stop respawning, quit to the main menu and then continue. You should be able to clear out the unicorns pretty quickly by just attracting their attention to get all of them to charge you, throwing down the invulnerability bubble and then using the spinning blade justice move to kill them all.
The turtles are a good way to grind out that last level's worth of XP after you complete the main game. Just equip the spinning sword, fill that justice meter, and saw your way through a few dozen of them. Outhouse away and back and repeat. Won't take long to clear out that last cheevo.
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