Young Justice Legacy

For this achievement, you need to collect 28/28 total dioramas. The times in parenthesis next to the costume indicates where in the respective video it can be found if you prefer a visual guide. The dioramas can be found as follows:

GREECE

MISSION 01 / ARRIVAL / RUINS
Cheshire Diorama – (0m01) - When you get to the fork in the path, break all the pots to your left and it’s right in the middle of the ruins at the top of the stairs.

MISSION 01 / ARRIVAL / DIG SITE
Sportsmaster Diorama – (0m35) - Shortly after you continue on the path up from the scaffolding, you’ll see loose looking rocks in between two wooden beams on the left. Break this wall down to discover a secret area with the diorama.

Cheshire Diorama – (0m58) - Once you reach the big open area with the temple, walk up the wooden walkway on the right all the way to a dead end with loose rocks. Destroy this wall to discover another secret area and progress forward to the diorama which is on the highest of three pillars by the waterfall.

MISSION 02 / A HOSTAGE CRISIS / MUSEUM
Sportsmaster Diorama – (1m38) - When you first enter the museum and take care of the first group of enemies, head up the stairs on the right and follow the railing around to the right till the end.

SIBERIA

MISSION 04 / COLD CHASE / SIBERIAN ICE PATH
Lex Luthor Diorama – (0m30) - Right after the sharp right turn, you’ll see two little divots on the right side. Destroy the ice wall on the second divot you come to and you’ll discover the Diorama and a secret area.

Killer Frost Diorama – (0m50) - Just keep following the path and on the last straight away you’ll see the diorama on a box to your right.

MISSION 04 / COLD CHASE / ICE RIVER
Icicle Jr. Diorama – (1m25) - After you cross over the gap for the fourth time (two boat sections after the missiles start raining down on you) you’ll see this diorama up on the boxes on the top of the screen.

MISSION 04 / COLD CHASE / BASE CAMP
Lex Luthor Diorama – (1m38) – after you reach the fourth villager you need to save located in the top middle of the map, there’s a fenced in area to your right when looking at the villager from where you came. Break through the fence and jump on the boxes to the diorama.

Killer Frost Diorama – (2m00) – When you walk into the next open area with the frozen villagers, jump up on the truck straight and to the right and then look left when on top of the building.

MISSION 05 / DEEP BURIED IN ICE / MOUNTAIN TUNNELS
Icicle Jr. Diorama – (2m23) – After you leave the room with the first group of enemies, look to your left for a strange wall before the path turns right. Destroy this wall and you’ll find the diorama on top of some boxes at the end.

MISSION 06 / GO WITH THE FLOW / FLOODING TUNNELS
Lex Luthor Diorama – (3m39) – In the first room it’s on some boxes on the left.

SANTA PRISCA

MISSION 07 / JUNGLE RENDEZVOUS / SANTA PRISCA’S JUNGLE
Bane Diorama – (0m01) – After the cut-scene at the first rendezvous point with Aquaman, you’ll reach an area with two trucks/cars. Jump on the one on the right and onto the boxes to reach the diorama.

Black Manta Diorama – (1m19) – at the last bend of the map, right before the final objective, walk around the corner on the left to see the diorama sitting on some small stairs.

MISSION 07 / JUNGLE RENDEZVOUS / HANGING STATUES OF SANTA PRISCA
Bane Diorama – (1m41) – When you cross the long bridge and can go either right or left, go right. At the end to the left is a raised gold face/statue that has the diorama at the top.

At this point you will unlock:


MISSION 08 / THE GODDESS SHRINE / ATABEY’S TEMPLE
Bane diorama – (3m38) – In the next room with the statue with multiple faces in the middle, the diorama is behind a bunch of vases in the upper left corner.

Black Manta Diorama – (3m56) – Go around the corner from the room with the face statue and right before the path curves, break the vine covered wall on the left and jump on the statue at the end for the diorama.

GOTHAM CITY

MISSION 10 / HOMETOWN / GOTHAM DOCK WAREHOUSE
Riddler Diorama – (0m01) – Right when you start you’ll see this on the boxes straight and to your left where the spotlight is moving.

Psimon Diorama – (1m12) – It’s right below the sniper at the end of the big area on the left side of the map on top of the boxes. You’ll have to time your jump right to be able to reach it.

MISSION 10 / HOMETOWN / GOTHAM DOCKS
Psimon Diorama – (1m35) – When you reach the middle of the map, you’ll see two light brown boxes next to a truck against a tower. Jump up on the trucks to get the diorama.

MISSION 12 / MINDTWIST / THE RIDDLER’S FUNHOUSE MAZE
Riddler Diorama – (2m56) – Get the combination wrong yet again to open the last door behind you. Get all the way to the button at the end and go up the stairs by it to find the diorama.

BIALYA

MISSION 13 / GLOBAL DISASTER / BIALYAN DESERT CANYON
Tiamat Diorama – (0m01) – Once you use the console to open the door, take the left and break the rock wall. Follow the bridge and path all the way down and climb the slanted pillar on the right side at the end.

Blockbuster Diorama – (0m56) – After you cross the first bridge on the main path, head straight and to the left corner. Destroy the wall, walk to the end, destroy another wall and then you’ll see the diorama.

MISSION 13 / GLOBAL DISASTER / ESAGILA’S ROYAL GARDENS
Tiamat Diorama – (2m06) – When you reach the courtyard with a pool and the big woman statue, take a right. At the end of the path it’s on the tallest of three little pedestals.

MISSION 14 / TAG TEAM / THE GODDESS TEARS
Blockbuster Diorama – (3m46) – When you leave the small room with the 6 robots and skeleton looking enemies, you’ll come to a left turn. Don’t turn left but break the wall to your right for a secret area holding the diorama at the end through a door.

MISSION 14 / TAG TEAM / THE OFFERING
Tiamat Diorama – (4m21) – At the very first turn you come to, look right and destroy the wall. The diorama is at the end.

Klarion Diorama – (4m54) – After you defeat the first big stone statue, take a right out of the room and destroy the wall straight ahead.

MISSION 14 / TAG TEAM / THE KING’S CHAMBER
Klarion Diorama – (5m27) – After the curved hallway, you’ll reach a straight hallway. On the right side in the middle of that hallway is a wall you can destroy with the diorama in it.

MISSION 15 / LEGACY / KLARION’S CHAMBER
Klarion Diorama – (The video doesn't have this one, but it's a small room so you should be able to find it) – Just to the right of Klarion when looking at his face in the corner.


Below are the video guides credit to Redemption Gaming

Edit: Updated the video links and timestamps