Tales from:

UFO Defence

• Using flying suits with heavy plasma to make holes on the top of an alien space ship and dropping High Explosives in the subsequent hole, alternatively getting visual on aliens with blaster launchers and mind controlling them
• Using low psionic skill soldiers as stun rod specialists and using them as point men on missions
• Doing Terror Missions and completing them with a positive score
• The feeling of power having global radar coverage, a powerful airforce, and enough ground defense systems to ignore any alien attempt to try and stop you from shooting down all their UFOs

TFTD

• Being able to smack a lobsterman with a melee weapon
• Being able to complete at least one of every terror mission type specifically cruise ships and artifact sites
• Learning about and being able to prevent the sneaky ambush attacks the enemy likes to do

Apocalypse

• Successfully identify and investigating infected buildings and getting a 100% hit rate
• Watching highly advanced trans-dimension alien craft being shot down by a swarm of hoverbikes
• Laughing maniacally when the aliens drop a Kaijuu on the city and it targets your enemies first
• When you can research and build shields and teleporter packs and can be decked out in XCOM propriety armour

XCOM Enemy Within

• MEC Trooper kinetic punch execution animation on all the big aliens
• Building a sniper that acts as a guardian angel with an archangel suit
• Making sure tutorial survivor, Hernandez does every mission and becomes the Volunteer
• Doing a mission with Annette and the Furies once they are Psi-Ops

XCOM 2 War of the Chosen

• Having to deal with a Warlock Avenger Defence during the Lost Dark Event, casually sniping for an hour trying to thin the aliens out, out pops a surprise Gate Keeper, PC stutters and I thought it froze as it revives I can only assume minimum 50+ enemies, most of it Lost and me bringing out every weapon and ability at my disposable to make sure the Gatekeeper dies before I do. I think that mission ended with close to 400 kills
• Having a templar rush into a group of enemies, activate his ghost, and have one of the ghosts and the templar reflect on the same turn from two different enemies while having bladestorm kick in with both ghosts and templar.
• Using a Reaper on supply drops with Lost, try get the Lost and Advent fighting each other while I keep my team hidden nearby the supplies for quick tagging when I need to go loud.
• Do final mission for legendary win - which is like attempt 80+ or something for this run, with a team of faction members plus 3 of my best units - templar is my unit I put most care into, chip down the last objective enemy, rush it with the Templar, it standing next to his objective and finishes it off with an Ionic Storm