Here is the full list of all 46 Nitro Kid achievements.
Unlock Security Level 5 with K31.
Win 5 runs.
Clear a room in 1 turn.
Win a battle with 1 HP remaining.
Defeat the Commander.
Play 20 or more cards in a single turn.
Upgrade 4 patches in a single run.
Finish a turn without playing a card.
Unlock Security with K31.
Defeat the Feuer.
Spend 10 or more Energy in one turn.
Defeat the Founder.
Unlock K31.
Unlock Security with J4X.
Defeat the Vine Queen.
Defeat the Twins.
Defeat a boss without taking any damage.
Unlock Security with L33.
Win a run.
Defeat the Freon.
Defeat the Brains.
Upgrade 6 cards in a single run.
Defeat the Scientist.
Rescue 1 Kid.
Unlock J4X.
Defeat the Fire Warden.
Win a run with more than 50 cards in your deck.
Die on the Rooftop Floor.
Win a run without using any Infusions.
Collect all Character archives.
Rescue 1000 Kids.
Use 4 Infusions in one turn.
Obtain all starter cards and patches for L33, J4X and K31.
Unlock Security Level 5 with L33.
Unlock Security Level 5 with J4X.
Unlock Security Level 10 with L33.
Unlock Security Level 10 with J4X.
Unlock Security Level 10 with K31.
Beat Security Level 10 with L33.
Beat Security Level 10 with J4X.
Beat Security Level 10 with K31.
Defeat the Creator.
Obtain all other achievements.
Win a run without gaining any patches other than the ones you start with.
Collect $2000 or more in a single run.
Rescue 100 Kids.