I did not see and Achievement guide yet so I decided to make one:
(This is my first guide ever so be nice)
Single Player:
Disciple (5g) complete one tutorial
This is a very easy achievement just simply complete one tutorial. If you are new to the N game series, I suggest doing all of the tutorials, just to get familiar. I did them all even though I beat the computer version.
Treasure Hunter (20g) Complete and episode and obtain every gold piece in Single Player mode
Simple again… I recommend using episode 1 or as it is called episode 0. Just do as it says and get all the gold
Perfectionist (20g) Complete and episode without dying in Single Player mode
Yet again, not very hard. Just use episode 0 as mentioned above. Also, if you cannot get all the gold without dying. You can do episode 0 twice… first time getting all the gold. Second time once you are familiar with episode just go through and do not die.
Practice Makes Perfect (15g) Die 1000 times in Single Player mode
Not nearly as hard/time consuming as it sounds. All you do is have to die 1,000 times just like it says. Most people get this between 15-25 episodes. Some who are bad might get earlier. Others who are good could go a bit higher. 1,000 deaths in N+ is not that much. It has not been confirmed that you can press X to kill yourself A, A (to start it up) then X again to kill yourself. But honestly who would want to test that or do that. Most likely works.
Complete 15 Episodes (10g) Complete 15 single player episodes
Easy to explain not easy to do. You must simply clear all the levels. If you get stuck watch the top 10 videos for somewhat help. Yet in my opinion this hinders you because they do moves to gain speed, time and gold. On some levels figuring out a path by your self helps. If stuck you could also ask a friend who is not amazing at the game how they did it and try that way. Just be patient.
Note: If a friend joins your game and helps you beat a level it DOESN’T count. You most do this in single player mode by yourself. Unless of course a friend who is good comes over to your house and does it for you. (ßYou laugh here)
Complete 30 Episodes (15g) Complete 30 single player episodes
See above
Complete 40 Episodes (20g) Complete 40 single player episodes
See above
Complete all 50 Episodes (25g) Complete all 50 single player episode
Toughest of them all. See above.
Multiplayer Achievements:
Complete 5 co-op Episodes (15g) Complete 5 co-op Episodes
Just get a friend or two (up to four players) or find/host a public match. The most important part is the host cannot be a weak link because he is often isolated. Not too difficult as long as you have a solid team.
Note: These must be done in Co-op (MP) which stands for Multiplayer Episodes
Where there are only 10 (So 0 -9 dumb numbering system) episodes. NOT co-op where all 50 single player levels can be done for fun with up to four people
Additionally: A glitch has been found and experienced by me, that after completing an episode even though it says saving you must go back to main menu for it to really save. So before you want to get off go to the startup menu to ensure a successful save. This has also been reported in Single player.
Complete 10 co-op Episodes (15g) Complete 10 co-op Episodes
See above. There are only a few tough levels in episodes 8 and 9
Speed Demon (20g) Win 10 survival games in ranked online matches.
Go to ranked multiplayer and host or search for a ranked match and win 10 of them. Each level counts as a win. So theoretically it can be done in one hosting if you win them all. You can have a friend/partner host and try to get in the same game and start it before anyone else joins the game. Then you can alternate to get 5 wins in each game or take turns winning an entire game. Either way it takes 2 games for both to get it.
In race mode it is first to get to the door.
Survivalist (20g) Win 10 survival games in ranked online matches.
Same as above except in survival mode. In survival mode it is not as title implies last one to die. In survival you have a timer that starts out at 60 and you must extend it by collecting gold. Every time you die you loose extra time.
In survival mode it is last one to have their timer run out.