No missable achievements (plus 34 unknown)
Sign in with Steam or Xbox to track your progress, and:
Kill your first enemy
Clear world 1, The Forest.
Kill 20 enemies in a single run without losing any health
Use 50 Specials from your inventory
Clear world 2, The Workshops
Fully upgrade a single statistic for any character
Kill 500 enemies in a single play through
Use a first-aid kit 50 times
Clear world 3, The Fortesque Mansion
Kill 500 Frogs
Die 100 times
Collect 50000 money
Use the Distract Monster Special from your inventory 50 times
Use the Ground Mine Special from your inventory 50 times
Use the Dynamite Special from your inventory 50 times
Find 28 gold keys in a single run
Use the Shotburst Special from your inventory 50 times
Destroy the Chaos Engine
Use the Bomb Special from your inventory 50 times
Resurrect 10x dead characters in co-op games
Use the Molotov Special from your inventory 50 times
Fully upgrade the Navvie character
Collect 10000 money in a single play through
Use the Freeze Monster Special from your inventory 50 times
Destroy the Chaos Engine with 2 players alive
Complete the campaign in a single run
Fully upgrade the Brigand character
Fully upgrade the Scientist character
Fully upgrade the Mercenary character
Fully upgrade the Gentleman character
Fully upgrade the Thug character
Complete single-player campaign playing as all six characters