*Updated as of the 4th December 2019*
To get the Pin-nacle 4 achievement you’re either going to have to spend A LOT of time or A LOT of money to unlock it.
After getting the achievement myself i can tell you that mathematically it is most likely you will get it by maxing out a Rare Pin due to the fact that there are fewer of them than Common or Epic Pins & the combined total is cheaper than the Legendary Pins.
Below is a full list of every pin upgrade cost in the game, the first column is level, the second is duplicate pin total, the third is coin cost & the final column is xp gained per level.
Common Pins:
2 - 10 / 50 / 4
3 - 15 / 120 / 5
4 - 23 / 220 / 7
5 - 36 / 350 / 9
6 - 57 / 500 / 12
7 - 90 / 850 / 16
8 - 140 / 1,400 / 22
9 - 230 / 2,400 / 30
10 - 360 / 4,000 / 42
11 - 560 / 7,000 / 58
12 - 890 / 12,000 / 81
13 - 1400 / 20,000 / 110
14 - 2200 / 34,000 / 150
15 - 3600 / 58,000 / 220
16 - 5600 / 99,000 / 300
17 - 8900 / 170,000 / 430
18 - 14100 / 290,000 / 600
19 - 22400 / 490,000 / 840
20 - 35500 / 830,000 / 1180
Rare Pins:
2 - 6 / 500 / 6
3 - 10 / 850 / 8
4 - 18 / 1,400 / 11
5 - 30 / 2,400 / 16
6 - 51 / 4,000 / 23
7 - 87 / 7,000 / 34
8 - 150 / 12,000 / 50
9 - 250 / 20,000 / 74
10 - 430 / 34,000 / 110
11 - 740 / 58,000 / 160
12 - 1300 / 99,000 / 240
13 - 2200 / 170,000 / 360
14 - 3700 / 290,000 / 550
15 - 6300 / 490,000 / 820
16 - 10800 / 830,000 / 1230
Epic Pins:
2 - 4 / 4,000 / 25
3 - 7 / 7,000 / 37
4 - 13 / 12,000 / 54
5 - 24 / 20,000 / 80
6 - 44 / 34,000 / 110
7 - 81 / 58,000 / 170
8 - 150 / 99,000 / 250
9 - 280 / 170,000 / 380
10 - 520 / 290,000 / 560
11 - 960 / 490,000 / 830
12 - 1800 / 830,000 / 1230
Legendary Pins:
2 - 2 / 50,000 / 250
3 - 4 / 80,000 / 300
4 - 10 / 130,000 / 360
5 - 20 / 210,000 / 430
6 - 40 / 330,000 / 510
7 - 90 / 520,000 / 620
8 - 190 / 830,000 / 740
As you can see the max level for Common Pins is 20, Rare is 16, Epic is 12 & Legendary is 8.
To upgrade every Rare Pin would require 338,936 Rare Pins & 26,248,950 coins, however you only need to upgrade one to the maximum level so there will be a degree of RNG for everybody as to the exact total needed due to getting pins randomly given to you by the chests you win or buy. If you hypothetically get 6 Rare Pins to level 15, another 6 Rare Pins to level 15 & a half & 1 Rare Pin to level 16 then that would take a total of 241,736 Rare Pins & 16,288,950 coins.
If you are a free to play player then the best way to level up is to get to Arena 7. It’s the earliest level you can get the best chests from winning & it will also be the easiest place for most people to get 5 game win streaks at the same time. Once you have your win streak just lose a couple of games on purpose so that you stay at the same COG level otherwise you’ll rank up too high making it harder to get win streaks & most importantly you’ll also run out of people to play because the higher you go the less people there are (last season i beat everybody & then couldn’t find a game for over 2 weeks!).
Taking an average of 15 wins per day with rewards of, 3 gold win streak chests, 1 giant gold chest, 1 large gold chest, 3 large silver chests, 5 silver chests & 5 small silver chests that would give you approximately 9036 coins & 89 rare pins.
You should also get 150 coins from completing your daily rewards, 300 coins from your weekly crew bounties & you would have to use some of the crystals you get from them as well to unlock some of the chests you earn everyday otherwise there will be times you win & won’t have any free slots left to receive your winning chest.
Getting win streak chests is also important because they contain horde tokens which allow you to gain more pins, coins & crystals. Being in an active clan is very helpful for playing horde games because it significantly increases the chances of finding somebody to play with & they will also be using their own horde tokens to start games as well, i’d recommend trying to play about 6 games of horde everyday.
The last thing to mention about rewards is at the end of every season which lasts roughly a month you get a reward depending on what league you finish in, with a few days to go it’s best to win all your games & get to the gold league where you’ll get a free mini Legendary Box.
Taking everything above into account if you did all of that every day it would take about… wait for it… 3 years & 10 months to max out a pin. (hahahaha yeah i know, it’s a joke).
The only other option is to spend real world money to get the achievement. A Legendary Box (which costs 2250 crystals) contains on average = 78,657 Coins, 5014 Common Pins, 1038 Rare Pins, 173 Epic Pins & 4.6148 Legendary Pins.
It would take roughly 233 Legendary Boxes to achieve this for a total of 524,250 Crystals which means buying 35 Crystal Mountains from the store for £3499.65/$3499.65.
So yeah it’s either play the game every day for two & a half hours for over three years or spend just under three & a half thousand dollars instead. I know it’s not good news but i would ask people not to down vote this solution & to voice your displeasure to the developers of this game instead. As new pins & chests come out i will be updating this guide. If anybody finds any typos in this solution then please let me know, thanks.