Here is the full list of all 14 Neighborhorde achievements.
Defeat the Alien Boss on Normal difficulty.
Defeat the Worm Boss on Normal difficulty.
Defeat the Wiz Boss on Normal difficulty.
Beat the Final Fight on Easy difficulty.
Beat the Final Fight on Normal difficulty.
Have 4 players joined.
Choose all the superpowers once.
Choose all the weapons once.
Kill a Foot with the Soccerball.
Ignite a Ghost with the Campfire.
Kill a Dodgeball with a Tetherball.
10000 all-time horde kills.
Unlock all wearable items.
Beat Boss 1 with no team downs on Normal.