While destroying blocks an egg can spawn and you will ride Louie, then you have to win the game, easy to do in a private match with another player

On Battle 64, you can choose the White or Red Bomber and raise the firepower to 8, achievement only ticks at the end of the game. On private mode you can set rules so that every character can go to max.

On Battle 64, you can choose the White or Blue Bomber and raise the bombs to 8, achievement only ticks at the end of the game. On private mode you can set rules so that every character can go to max.

On Battle 64, you can choose the White or Black Bomber and raise the speed to 8, achievement only ticks at the end of the game. On private mode you can set rules so that every character can go to max.

Place and bomb and get hit by it

When switching stages, the floors will fall from the sky, just get hit by it

There are some stages in Standard Mode when hosting private matches, like Central Yard and Pixel Land, where there is a dark hole. You can obtain this achievement by falling into this hole. You can easily push other players into this hole if you use Simon Bomber or Raiden Bomber's special ability.

Die by a player with the Pyramid Head avatar

I believe any collectives from ranking up will count towards this achievement, got it while ranked up to silver.

Can also be done on a private match on Battle 64 mode with only two players

Be the only player in a area or kill everyone on that area

Arrow Up + A, B, Y or X to taunt on the controller

R1 + A, B, Y or X to taunt on the controller

Create a private match, change game mode to grand prix and win a game.

Create a private match, change game mode to grand prix and collect all 25 crystals

Create a private match, change game mode to grand prix and don't die on the first round.

Create a private match and set rules to Rounds: 1, Time: 1 min and Pressure Blocks: Off, you will have to play two rounds one a tie and then a winner, only at the end you will it trigger.