This guide will show a very helpful trick for the people who are just play this game for the achievements/items.

All the underlined achievements will be achieved by using this strategy.

One Hand Clapping
Win a hand.

I Tournament to Do That
Win a tournament.

Chip on Your Shoulder
Purchase a set of chips.

Deck the Halls
Purchase a deck.

Felt Up
Purchase a felt.

We'll Drink to That
Purchase a drink.

Border Crossing
Activate the Borderlands deck, felt, and chips simultaneously.

Trophy Wife
Win Claptrap's bounty item.

Banjo Hero
Win Sam's bounty item.

Book 'Em
Win Ash's bounty item.

Orb 'n' Legends
Win Brock's bounty item.

Sam to the Max
Activate the Sam & Max deck, felt, and chips simultaneously.

Joint Venture
Activate the Venture Brothers deck, felt, and chips simultaneously.

Army Surplus
Activate the Army of Darkness deck, felt, and chips simultaneously.

This Was a Triumph
Activate the Portal deck, felt, and chips simultaneously.

Personality Goes a Long Way
Win GLaDOS's bounty item.

Unlock all the Things
Unlock all decks, felts, and chips.

We Are the 1%
Achieve a lifetime balance of one million dollars

If you only have the game for the TF2 items you should mostly use the strategy shown in the next section. You get the items by winning a 'bounty item' in the game.
Every character has a bounty item (including GLaDOS), if you complete some challenges which are given at the start of your tournament you will be able to get the bounty item next tournament.
If you want to see your challenges in mid-game click the arrow in the bottom right corner.
When a character has put a bounty item on the table you can win it by winning the tournament.

If you close your game you will have to replay your hand, you can obviously use this to your advantage.
The first thing you should do is complete your bounty challenges.
Once you completed the challenges you will just have to go all-in every round (not straight away because they will fold), if you lose the hand you close your game and restart it before you start with the next hand.
Keep doing this until you have all of your achievements/items.

The other achievements all have to do with unlock points which you will get by playing tournaments.
It's also possible that you do not yet have the 'We are the 1%' achievement but you just have to keep playing tournaments for that one.
To get the other achievements you will have to purchase things with unlock coins.

These are the achievements which are still left.

Chip on Your Shoulder
Purchase a set of chips.

Deck the Halls
Purchase a deck.

Felt Up
Purchase a felt.

We'll Drink to That
Purchase a drink.

Border Crossing
Activate the Borderlands deck, felt, and chips simultaneously.

Sam to the Max
Activate the Sam & Max deck, felt, and chips simultaneously.

Joint Venture
Activate the Venture Brothers deck, felt, and chips simultaneously.

Army Surplus
Activate the Army of Darkness deck, felt, and chips simultaneously.

This Was a Triumph
Activate the Portal deck, felt, and chips simultaneously.

Unlock all the Things
Unlock all decks, felts, and chips.

If you go to unlocks after winning a tournament try to buy as much of the things as you can but do it set by set.
Start out with the Borderlands set and go on untill you have all of the achievements.
To achieve the 'Border Crossing', 'Sam to the Max', 'Joint Venture', 'Army Surplus' and 'This Was a Triumph' achievements you have to start a tournament while having a full set equipped (deck, felt and chips).
If you have all the unlocks you will get 'Unlock all the Things'.

The only achievement which will be left is 'We'll Drink to That'.
You can achieve this achievement by purchasing a drink in the game, to do this click on the arrow in the bottom left corner and purchase a drink for a character.
The more drinks you buy them the more they show that they're bluffing.
It isn't needed to get them all drunk if you're using the method described before because it will just waste your unlock tokens.

I hope this guide was helpful, if it helped you please rate, comment and maybe even favorite it.
I'll be active in the comment section so if there are questions just place them down there.

Thanks for reading this guide.