Here is the full list of all 61 NGU IDLE achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Boss 10 is uh... it's defeated. You defeated it. The name basically says it all.
Boss 20 Defeated!
Boss 30 Defeated!
Boss 40 Defeated!
Boss 50 Defeated!
Boss 60 Defeated!
Boss 70 Defeated!
Boss 80 Defeated!
Boss 90 Defeated!
Boss 100 Defeated! Ooh, now the skull is all blue and shiny.
Boss 110 Defeated!
Boss 120 Defeated!
Boss 130 Defeated!
Boss 140 Defeated!
Boss 150 Defeated!
Boss 160 Defeated!
Boss 170 Defeated!
Boss 180 Defeated!
Boss 190 Defeated!
Boss 200 Defeated! Oh snap, they have red skulls now!
Boss 210 Defeated!
Boss 220 Defeated!
Boss 230 Defeated!
Boss 240 Defeated!
Boss 250 Defeated!
Boss 260 Defeated!
Boss 270 Defeated!
Boss 280 Defeated!
Boss 290 Defeated!
You defeated them all! Now to move on to EVIL difficulty...
Obtain over 1 Million Energy!
Obtain over 1 Billion Energy!
Obtain over 1 Trillion Energy!
Obtain over 1 Quadrillion Energy!
Obtain 1 Million Magic!
Obtain 1 Billion Magic!
Obtain 1 Trillion Magic!
Obtain 1 Quadrillion Magic!
You can give this resource its own name in the settings menu!
Obtain 1 Million of Resource 3!
Unlocked the Augmentation Feature!
Blood Magic Unlocked!
NGU's Unlocked!
Yggdrasil Unlocked!
Gold Diggers Unlocked!
Beards Unlocked!
Questing Unlocked!
Hacks Unlocked!
Wishes Unlocked!
Survive an attack from an Exploder type enemy!
Took the plunge into Evil Difficulty for the first time.
I'm so proud of you.
Completed your first troll challenge... I'm sorry :c
Obtain 9 QUINTILLION Energy, the most you can have in the game!
Obtain 9 QUINTILLION Magic, the most you can have in the game!
Obtain 1 Billion of Resource 3!
Obtain 1 Trillion of Resource 3!
Obtain 1 Quadrillion of Resource 3!
Defeated the Traitor and earned the final END piece.
Wear a set of gear on your body, all at level 69.
F's in chat for you, 'cause you're in for a world of pain.