Hello! All achievements can be earned with 2 players

BOUNCE
Honey I Shrunk/Stunk - These 2 achievements should be earned at the same time. If you re-use a word in this pong game, your paddle will shrink and give you the first achievement. Re-use the same word a third time and you'll get the second achievement.

HILO
When They Go Lo, I Go Hi - In this game mode, your first two guesses will be for the highest ranked answers. Then your third and fourth guesses will be for the lowest ranked answers. During your third or fourth guess rounds, pick the answer that is #1.

Groupthink is Bad - For the fifth guess, it will be an either/or choice between two answers. Have all players in the game pick nothing and let the timer run out.

SQUARES
Alley-oops - When it is NOT your turn, you can input possible answers that you can then click to respond with when it is your turn. Write out a clearly fake or made up answer when it is not your turn, then select it when it is your turn.

Yoink - One team picks an answer and gets a square, the other team picks a higher ranked answer within the same square range. No real strategy for this, I'd say... just play a game or two and this should come naturally.

SPEED
Top Speed - Get all 10 of the top10 answers. This is tough. My advice is to pick a category where the answer set is small or more factual. Then pause the game with ESC once it starts, Google common answers to the prompt, and then input all of them while the game is paused. When you are done, unpause and they'll all submit. Hopefully you get all 10. Here is a list of some top10s from my own games.[imgur.com] and some more[imgur.com] from user Hiperion

THE REST
Pandering - In any game mode, at any time, input the word "Jackbox"

Participation Trophy - Play an entire game without revealing anything on a list. MUST BE DONE IN TOUR GAME MODE. Then let it idle through all the games. Disable tutorial to make it faster. In Square, you must declare the game a draw after 3-4 rounds. Takes 10-15 minutes in total to let all the timers run out while doing nothing.

edit on this: the Developers have stated this is earnable in any game mode, as long as you answer at least once incorrectly while playing, and then let the timer run out. in my playing, this was not the case, but I will note it here for others to try.

edit #2: you MUST end the game via player 1 on their device, and then the achievement will pop afterwards with the credits roll.

Secret - Type "secret" as an answer. This works when playing in English. If playing in a different language, check the comments for the correct translation! Thanks to @AlexSTO for this one.