Those achievements can be unlocked using: Easy Mode ; Normal Mode ; Co-op Mode ; take turns mode'

2 HIdden-
2 hidden achievements are: answer 500 questions correctly and answer 1000 questions correctly which is easiest to be done on taking turns mode. Play>Local multiplayer>taking turns mode. while there choose 1 controller like your keyboard and choose 10 players thats the max amount a player can choose. you will be able to answer 1 question 10 times and so on until you'll have 1 character that has all the questions right. Its the fastest way to do this.

Last minute -
Also people who struggle with timer achievement go to take turns game mode as shown above and do the same just answer the question on the last second "when timer is on 1"

A good start-
The path of glory -
Quick thinker-
Champion-
Ultimate champion-
Go to Normal mode and do this>
for people to win it and complete the game I suggest use google or chatGPT for answers
in chat GPT type the question leave "?" mark at the end and then write "short answer". I suggest copy text "short answer" and paste it at the end of every question you gonna ask chat GPT its gonna make asking question quicker.

Budding champion-
In Easy Mode and do the same as ^

Teamwork-
Play>Local Multiplayer>Cooperative and do the same as above ^