patch 1.0.4. brings a new good bug works the same way but this way it depends on skillsCookie Kenku
found a positive glitch with Gunslinger. It happened that "Cooldown" ability upgraded only for 1 level makes every other ability recharged instantly, so you can use "Slomotion" through the entire level. The rest of my solution is works fine with this bug.This dont work with patch 1.0.3
if you play on an older patch this will still work :)
You can get the Chevos
easily with a little bug this works only til version 1.0.2. for newer versions look on top
you need a gunslinger with slomotion skill and the 4th lvl cleared if not cleared you need to finish the early levels with this bug before!
go in any level you like. activate the slomotion skill and instantly use the menu button in top right corner of the screen
press home button and confirm your choice.
now press GO and choose lvl 5
and voila the slomo skill is bugged you have it the hole fucking lvl including the boss fight.
i was a lvl 50 Gunslinger
Sword (dmg) 108+1 (starter weapon)
Shield (def) 51+2
Heart (life) 925+13
Blitz (Spd) 1128+0
My Skill lvl
Atk Speed Mastery 7
Second Chance Max (1)
Charge Attack 4
Double Jump Max (1)
Combo Mastery 8
Combo Frenzy 6
Slam Max (1)
Slow Motion 1 (no upgrades needed because bug
Tripple Jump Max (1) (this is not needed i think the tripple jump is useless ;)
Combo Extension Max (1)
Cooldown Mastery 5
Firework 3 (dont now how this skill works its useless for me and my points are wasted
i got with this setup round 930 combo after i reached the boss i hammer my finger on the screen for the rest of my hits and beat the boss my first time :)
EDIT: if you die or fall to often in a pit you need to restart the level or use the Revive but BEFOR dying use the slomotion Skill again to have the bug again after dying.
any problems with the solution ask in the comments before downvoting ;)