Location: Prologue First Half (You'll understand what I mean by first half once you finish it)

-Take the blu-ray
-When presented with the option to watch the video, do the opposite
-Select the "Wait" option whenever it comes up
-Achievement triggers on the third selecting of "Wait"

Location: Prologue Second Half

-Go through prologue until you are given the choice to ask Murasaki something over call to confirm reality
-Ask for the color of her panties
-Achievement will trigger

Location: Sakura's chapter

-When presented with the option to either "Think Lewd" or "Think of how much you love Chiyako", choose "Think Lewd"
-Hit the quick time event that happens the next day
-Choose "Squeeze Harder"
-Achievement will trigger

Location: Sakura's chapter

This one's a bit finicky, but from my hunting for this one this is what I managed to deduct.

-Be on the route to non-romance ending, but select the choices "Want more?" and "Press the issue"
-Choose the "Confirm the situation" option when it pops up
-Choose "Address Her"
-Achievement triggers after the really weird CG appears

To ensure you're on the correct route, use https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1943614614 and choose everything that isn't listed in the guide except for what is stated above (Credits to Teal! for the ending guide)

Location: Kotoha's chapter

-Complete all conditions for romance ending route (refer to linked guide above)
-When presented with the option "I want to see your thighs" select it (Will be on final day after the "believe in heaven" dialogue options)
-Achievement will trigger(and you get a few very deserving slaps)

Location: Sakura, Kotoha, and/or Mari's chapters

-Whenever the cat jumps at you, hit all quick-time events
-Achievement will trigger afterwards

(I'm unsure if this is tied to just dodging the kitty in one chapter, or all of them)

Location: Mari's chapter

-Must complete all TTRPG fights in her chapter with victory

This one might take a while, but a neat thing is that if you complete her chapter and replay it, all the gained abilities stay even in fights you wouldn't have them.

General tips:
-Desperado Attack is useless and should be avoided unless you are close to full HP or at full HP (And even then it really is too risky to use)
-Spray Machine Gun is a glorified full heal (or at least heals much more than Recover)
-Mari should avoid attacking unless both her and Shuiichi are close to full HP and can tank a large hit


The fight against the Demon Lord is the only one you can actually lose, so I'll elaborate a little further on it.

-Recommend you create a saveslot before engaging
-When Shuiichi is blocking the Demon Lord, do not attack. All damage directed at the Demon Lord will be redirected at him.
-Hit the 2 QTEs to free Shuiichi
-Must keep both party members up or else Demon Lord's attack overwhelms one person
-Must defeat DL 3 times to actually win
-Just keep switching between healing or partial offense depending on the active phase and victory should be assured.