Here is the full list of all 66 Evil Heart Fever achievements.
More range
One more heart
Sodom and Gomorrah
Dash saw cut
Infernal Feelings P.III
Meet and Kill Blue Cherub
More speed and damage, less range and wisdom
More speed and dash, less wisdom
Great Cthulhu inside me
Damage, shotspeed and range, wisdom down
Meet and Kill Archer Cherub
More damage, less range
More fire rate, less speed
Range, wisdom down
Meet and Kill Principality
Dash loads faster
More damage, less wisdom
Meet and Kill Dominion
One in all and all in one
Meet and Kill Virtue
Tadpole Missiles
Infernal Feelings P.II
Infernal Feelings P.I
More range and wisdom, less speed
Meet and Kill Seraph
Meet and Kill Light Red Cherub
Meet and kill Baby Blue Cherub
Very dangerous
Meet and Kill Power
Cyber Form
The present is theirs; the future, for which I really worked, is mine
Life up, speed down
Dengue, Chikungunya, Zika
Bot Mines system
Laser weapon system
Cut it all
More damage and dash, less range and wisdom
Wisdom up, speed down
More fire rate
More movement speed
Meet and kill Cherub
Initial Form
Demon Form
Metal Form
Ancient Form
Plague Form
More shot speed
More damage, less life
Bad habits
Range up, wisdom down
The clamping force
Death is part of life
Meet and Kill Red Cherub
Meet and Kill Purple Archer Cherub
Meet and Kill Smurt Cherub
Meet and Kill Rage Cherub
Meet and Kill Gamma Ray Cherub
Meet and Kill Silver Cherub
Meet and Kill Gold Cherub
Meet and Kill Super Cherub
Meet and Kill Throne
Meet and Kill Archangel
Meet and Kill Angel
10% Open
50%
100% Hell