pro tip for runner minigame : maxed out reboind shot in a forward / up angle can kill most of the enemies , all you have to do is to not fall in the hole and you can easily get the "hard" badge
Heres some MUCH needed help : levels (especially later on) are pixel perfect , try to ace a few earlier levels alone or with a guide to get bonus levels , first 3 are easier then the ending levels . Also keep the mouse in he same place and use "R" to reset , thankfully physics are always the same
pro tip : put on x3 speed , the point decay from calling waves early will stay the same , allowing you to get more points from that. could help you pass the expert mark
Honestly , the game sucks lets face it , but you can basicly put x3 speed and AFK, then just use your money to finish whatever task is set up for you. i did that and got all achievements in 1 day
 "Ebul"){kind=icon}
 "Pixelvader"){kind=icon}
 "The Journey Home"){kind=icon}
 "Bubble Tanks Tower Defense"){kind=icon}
 "Jump Out! The Pinball"){kind=icon}
 "Diamond Hollow II"){kind=icon}
 "Jacksmith"){kind=icon}
 "3 Slices"){kind=icon}
 "The Enchanted Cave 2"){kind=icon}
 "Batty Bat"){kind=icon}
 "Tarnation"){kind=icon}
 "Pyro II"){kind=icon}
 "Five Minutes to Kill (Yourself)"){kind=icon}
 "Moon Waltz"){kind=icon}
 "Magnetized"){kind=icon}
 "mini Tower Defence (mTD)"){kind=icon}
 "Shop Empire 2"){kind=icon}
 "Spewer"){kind=icon}