Here is the full list of all 31 Ultimate Chicken Horse achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Enter sudden death 20 times
Score 50 comeback points
Kill someone with a hockey puck shooter 100 times
Place 1000 traps
Play online with a local friend
Play 50 games online
Score 100 solo points
Play 100 games
Get 10 post-mortem points
Kill someone with an arrow 100 times
Unlock all levels
Teleport 50 times
Unlock all outfits
Die 50 times in a black hole
Unlock all characters
Get 50 coins
Win without any special points
Wall jump 1000 times
Place 200 traps
Play 30 games
Fall into the void 100 times
Unlock a character
Play 10 games
Play 10 games online
Kill people with traps 100 times
Die with the coin 10 times
Die on barbed wire 10 times
Unlock a level
Unlock an outfit
Attach two blocks together with glue
Glue four blocks together