Here is the full list of all 51 KRUNCH achievements.
Don't be touched by a Haunt in "Life of the Party"
Take the selfish way out for the first time
Conquered the Sewers for the first time
Conquered the Mines for the first time
Conquered the Tech Bay for the first time
Conquered the Boiler for the first time
Conquered KRUNCH for the first time
Collect all Krebs in "Deep Pockets"
Race the smasher in "Debris Crusher"
Collect all Krebs in "Hell on Wheels" without being touched by a saw
Collect all Krebs in "Dealing with Bullies" without being touched by a Haunt
Conquer "Haste Makes Waste" in under 15 seconds
Survive "The Meat Grinder" without touching a saw
Collect all Krebs and complete "Led Astray" in under 25 seconds
Collect all Krebs and finish "Operational Core" in under 25 seconds
Complete "MicroShock" in less than 20 seconds
Collect all Krebs and finish "Haywire" in under 15 seconds
Collect all Krebs and complete "Security Checkpoint" in under 15 seconds
Collect all Krebs in "The Wind Tunnel"
Complete "Synchronized Boosting" in less than 15 seconds
Complete "Through the Crucible" without catching fire
Find and collect all Krebs in "Combustion Intake Pipe"
Collected all Krebs in the Sewers
Collected all Krebs in the Mines
Collected all Krebs in the Tech Bay
Collected all Krebs in the Boiler
Collected all the Krebs in KRUNCH
Conquer the Sewers in under 7 minutes in a single run
Conquer the Mines in under 10 minutes in a single run
Conquer the Tech Bay in under 10 minutes in a single run
Conquer the Boiler in under 13 minutes in a single run
Conquer KRUNCH in less than an hour in a single run
Experience death 1,000 times overall
Play KRUNCH 100 times overall
Collect 5,000 Krebs overall
Get touched by saws 500 times overall
Get chomped by Slugger 50 times overall
Self-destruct 100 times overall
Get killed by walls 100 times overall
Get killed by The Lady 50 times overall
Get scorched by lava or flamethrowers 100 times overall
Earn a score of 14,151,829 or more in the Leaderboards
Get killed by spikes 50 times overall
Get killed by bombs 50 times overall
Get killed by saws 20 times overall
Get eaten by Slugger, Spawns or Gobber 75 times overall
Get killed 500 times overall
Outrun Slugger in under 1 minute
Get eaten by Gobber 50 times overall
Get killed by a Haunt 20 times overall
Play KRUNCH for more than 5 hours