Although I would love for this achievement to remain as rare as it is currently, I feel that it is my duty as a 100% Super Raft Boat completionist to help fellow achievement hunters who looked at the already existing guides for this achievement and shook their head with disappointment. (no beef, they just didn't tell me things except for what I already knew, sorry)

I've found the easiest way to get the achievement is as Roboto with the Machine Gun. Another guide explained very nicely that it is possible to get the achievement with the Laser Rifle but that your aim has to be flawless in order to succeed. Yet another guide talked about how you can get the effects of the plastic straw (which slows down enemies to 75% of their original speed) by lowering your FPS. I didn't need to do this to get the achievement and also didn't test to see if it works but if you are still having trouble after a couple hours of trying to get the achievement you could try it out.

Now would be a good time to mention the setup I used to beat the game was Roboto with his Machine Gun, Venuz's Blessing, Sheet Metal, Granola Bar, Hot Sauce, Romantic Novel in that order.

Once you start the game immediately start expanding your raft. I start by making a square shape in the bottom right corner of the screen as you can see in the image. (where I'm standing was the previous center of the raft). For the first 2 rounds it's pretty easy to survive without any attack boosting accessories but most of the time you'll be forced to choose them out of order so it doesn't matter.

Necessary accessories to have to get the achievement are the Granola Bar, Venuz's Blessing and Hot Sauce. Otherwise viable options for accessories are the Romantic Novel, Vampire Fangs with Dead Fish, Sheet Metal and Plastic Straw being 1 of your back up items.

Additionally I would suggest only grabbing a dice on the first round if you have no other options and if its not one of the accessories I mentioned then you should restart the game.

Finally a tip for the Kraken boss fight; don't stop moving. You should be able to unload 1 round of your machine gun into the boss and kill a tentacle before the others start spitting their goop. Once that happens don't stop moving unless you have to, to avoid running into some ink.

After breaking the beach chair and starting the next loop on this raft you want to build far left and right such that you can catch the penguin egg that will float by after the first wave of the round. Completing the challenge is difficult but it will reward you with one extra accessory which by this point should either be the final necessary one you're missing and hopefully not a throwaway. If up until this point you have collected all the recommended accessories then you might as well try to get to loop 3 since you've made it this far.

2 bonuses to collecting the penguin is that as long as you keep it alive aka. not letting it float away when there is no raft under it then you can have a helpful ally to shoot enemies for you. Secondly there is only 1 round instead of 3 which means you technically have less of a likelihood of meeting an unfortunate end. There will of course still be a boss fight before you can proceed to the next loop.

Since there are so many enemies, with the machine gun you should be able to open fire for most of the waves since with the granola bar and the fact that you are killing things so quickly you should essentially have infinite ammo. If however your machine gun ever goes on cooldown you will likely die so you will still need to reserve yourself from going all out.

During this loop it will be necessary after every wave to save a fish or other enemy so that you can re-expand your raft. In case you don't know you can do this by not killing the enemy and running around in circles such that they cant hit you. You can then use this time to build your raft to whatever size you like. If you don't have the Metal Sheet accessory (or if it glitches out) then you'll need to exercise extreme caution that all of your raft parts do not break. Finally it is best to be at half a heart below full as often as possible such as to accumulate hearts on your raft for when you are in dire need. And once you beat the boss...

Break the chair for the third time and you've done it. From here on you can proceed to either die in the next round or try making it as far as you can. Nevertheless once you are killed or sit in the next chair you encounter (which is what I did) you'll get the achievement that you've undoubtedly been craving. Don't fear admitting what I already know. Trust me, I feel your pain. Your incessant Googling and frantic scrolling through steam guides to try and find anything that could show you a surefire way to victory. It's fine, calm down, you're safe here in my arms. Everything you need is right here. Everything is fine. This is fine.

Character: Roboto
Weapon: Machine Gun
Necessary accessories: Granola Bar, Hot Sauce, Venuz's Blessing, Romantic Novel or Vampire Fangs. (Romantic Novel recommended)
Options for Single mediocre accessory: Dead Fish, Sheet Metal and Plastic Straw

If you don't get all 4 (or 5) necessary accessories its suggested you restart such as to not waste time.

- After first loop build left and right to guarantee you pickup the penguin egg to get a 5th accessory
- After second loop is initiated after every wave use the fish dodging strategy to expand your raft to a reasonable size before starting the next
- Accumulate hearts on your raft for when you need them by staying at half a heart below full
- After destroying the beach chair for the third time you wont need to beat the boss to get the achievement

Thanks for looking at my very first guide. If you think there is anything I should add or change please comment and if I find it important I will definitely update the guide.

Congrats on your skin that you will never use because you're done with the game forever. At least your newest perfect game can be added to your collection. And that's worth it... right?

I would like to thank and shout out the 2 guides that helped me make this guide them being:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2406492659
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2523893596
While they didn't give me all the information I wanted, they were a stepping stone to getting the achievement myself and making this guide. Those guides have there own purposes outlining tons of general game sense and knowledge that are not in this guide because that's not its purpose.
Also there is a video of somebody getting the achievement that I only found after I got it. And while it doesn't follow my exact philosophy on how to get the achievement the easiest way possible it is still helpful for studying other possible techniques.

And with that, finally, I hope you have a wonderful time grinding for this achievement.

(Also credit to the same YouTube video below for "allowing" me to "borrow" the thumbnail and use it for in this guide)