XCOM 2
87 Achievements
The Few and the Proud
Beat the game on Commander+ difficulty without buying a Squad Size upgrade
0.3%
How to unlock the The Few and the Proud achievement in XCOM 2 - Definitive Guide
After every group of enemies you encounter I would reload and wait several turns to refill void lance, domination etc before moving into the next group of enemies. The ranger with repeater kills so.many enemies especially using the double shot skill including the avatars at the end of the mission.
That's how I lined up for the last mission but it doesnt matter what team you bring the important thing here is you can delete the school before the last mission and still get the achievement.
Works in base game only, it does not in War of The Choosen.
Achievement is quite easy with infinite turn glitch. This glitch works in standard and Ironman playthrough, on any difficulty.
To make it work you have to save game short before you finish last move of your last character after which normally enemy would have his turn and then load that save. You will still have your turn while enemy looses his.
Just be carefull with few exceptions, enemies who transforms from other forms or pop up can still make their move so watch out when you want to trigger them - this applies for Andromedons, Chryssalids and Faceless.
Using this glitch you can even go for all below achievements in same playthrough:
Squad Size I and II are purchases you can make from the Guerrilla Tactics School (GTS) to increase the number of soldiers you can deploy per mission. In order to obtain this trophy, you must not purchase either of the Squad Size upgrades. This would make the game significantly harder but there is an extremely useful workaround available i.e. if you demolish the GTS before beginning the final mission, you will lose your Squad Size upgrades and the trophy will still pop upon completing the final mission. You will still have the beat the final mission with only 4 soldiers (5, if you count the special unit you are given) but you can play the rest of the campaign with as many soldiers as you want.
If you want to do this legitimately, I suggest having one soldier of each class on every mission. You may find it useful to replace your Sharpshooter from time to time (particularly on timed missions) and you will eventually want to find a permanent spot on your team for a Psi Op unit. I do not recommend attempting this trophy on an Ironman playthrough.
Before the PENULTIMATE mission (capture of the TV tower), you need to demolish the compartment with the partisan school, all skills from it will disappear, including squad expansions. Complete the last mission - the trophy is yours. Verified.