Seed of the Dead Sweet Home All Achievements List Guide
This ones are likely to be achieved by just naturally progressing through the game. No real effort is required to hunt these down.
Xanadu Act1 clear
Nightmare Act5 clear
Family Act8 clear
Shopping for the first time Buy and sell at the item shop
First step in demonstrating strength Purchase skills at the Weapon Shop
Facility Expansionist Expand the facility
A little good friend Watch intimacy events
Lovey-dovey with Hikari Hikari's intimacy becomes 10
Lovey-dovey with Aya Aya's intimacy becomes 10
Lovey-dovey with Kirara Kirara's intimacy becomes 10
Lovey-dovey with Ichika Ichika's intimacy becomes 10
Lovey-dovey with everyone Everyone's intimacy becomes 10
You are strong enough Purchase all the skills
Greatest sponsor Set facility level to 6
Precious bullet Consume 100,000 bullets
Savior Perform 200 successful Perfects during heroine recovery
These ones require a bit more effort in some form.
My fave princess Present 3 costumes to a specific heroine - Costumes can be found on Acts 7 and 8
The shaking thing - Shoot the girls many times in their "sweet spots" I don't know what the exact number is, if I had to guess, it's 100 times as of patch 1.041.
Go beyond my score Earn 567,859 points in one battle
Some ideal skills to take would be: Extra point 3 (of course) Revolver (quick to reload, quick to kill normal enemies) Remission 3 (super fast healing time is necessary) Sage Time (basically doubles stats during buff -> this includes damage) Full of Vitality (so you can do some happy time without having to take damage)
After those five it's about how well you can play. If you're maybe not the best FPSer, get something defensive like Steel Body 3. If you can one man army just fine, get Main Reload Speed 3. If you're struggling to keep the girls up, get Recovery Rate Increase 3. Just run Act 7 or 8, take it slow, kill everything, happy time often. Act 8 you can farm enemies that spawn with the final boss.
Note: Sometimes the achievement doesn't pop despite getting over the score requirement. All I can suggest is run it again.