All 58 Achievements & the Platinum Roadmap
1000G / platinum in ~4 playthroughs — and the modifier trap that locks 11 of them
Enabling any Difficulty Modifier preset locks 11 high-value achievements: Living Legend, Heroes Never Die, Mix Master, MYTHIC, Beat the Drop, Hot Streak, Like Old Times, Frugal Fire, Map Quest, Jiralhanae Conservationist, All Shield, No Yield. In co-op, if anyone in the fireteam has modifiers on, the whole team is locked for the session. Set Settings → Gameplay → Modifier Preset → None(every player). Skulls are NOT modifiers - skulls don't lock achievements (LASO requires them).
The Roadmap: 4 Playthroughs
1. Heroic collectible run
Sweep all 39 skulls and 13 terminalsin one Heroic pass (banking Heroes Never Die as a floor). Do collectibles FIRST - your Legendary and LASO runs shouldn't be hunting skulls. Pick a short mission to attempt All Shield, No Yield (Heroic+, lose shields but never health). Three skulls in, Campaign Remix unlocks.
2. Campaign Remix run
Work through Remix: REMIX! (one mission), Beat the Drop (one mission deathless), then Mix Master (all 13 deathless) - widely called the hardest non-LASO achievement; leave it until you're sharp. Knock out the skull challenges (Hot Streak, Even Tempered, Like Old Times, Frugal Fire) and mission challenges along the way.
3. Legendary run
Living Legend. Difficulty stacks, so this also clears Normal/Easy if you skipped them. Use the mission walkthroughsfor the choke points (the Truth and Reconciliation gravity lift, the Maw's Warthog run).
4. LASO run - MYTHIC
The finale: Legendary with the official 17-skull LASO set forced on. Co-op makes it far more forgiving - Iron only sends the team back to a checkpoint instead of restarting the mission. Expect the total 1000G/platinum journey to land around 25-45 hours (community estimate).
The Full List (58)
Mission completion - 13 achievements (10G / bronze each)
One per mission: The Autumn Leaves, Installation 04, Infiltration Anticipation, Bee Thirty, Control Alt Delete, This Stuff is Your History, Protocol Dictates Action, Double Trouble, Captain's Orders, Dust and Echoes Evolved, plus Before the Fall / Tiger Company / Personal Space for the three Operation: METEORITE missions.
Difficulty - 4 achievements (stack downward)
Greenhorn (Easy, 10G) → Birth of a Spartan (Normal, 20G) → Heroes Never Die (Heroic, 30G) → Living Legend (Legendary, 40G / silver).
Collectibles - 18 achievements
Per-mission "all skulls + terminal" clears (13 × 20G: Clean Sweep, Successful Search, Plundered, Buried Treasure, Stowed in Snow, Proto Gravemind, Timeless Tomes, Outpost Discoveries, Priorities, No Rush, Souvenirs, Brute Loops, Parting Gifts), plus Cranial (first skull), Making a Necklace (22), Headhunter (all 39, silver), Lore Have Mercy (all 13 terminals), and Collector's Addition (everything, 50G / gold).
Campaign Remix - 3 achievements
REMIX! (finish one Remix mission), Beat the Drop (one deathless, 20G), Mix Master (all 13 deathless, 40G / silver).
Cumulative counters - 6 achievements (10G each, cross-playthrough)
Bad Gas (pop 100 Grunt methane tanks), Plate Tectonics (25 Hunter armor plates), New Whip (hijack 10 vehicles), Disarmed (sever 100 Flood limbs), Claims Adjuster (50 vehicle parts), Make Them Count (100 headshot kills). These accrue naturally - don't farm them.
Skull challenges - 4 achievements (20G each)
Hot Streak (Floor Is Lava, one mission without dying), Even Tempered (finish Halo with Temperamental without angering allies), Like Old Times (finish Two Betrayals with Speed Limit + Endurance Spec + Hip Fire + Armistice), Frugal Fire (Famine + Recession + Johnny Ammo Seed, one mission without running dry).
Mission challenges - 8 achievements (10G each)
This is My Ship Now, Map Quest (Silent Cartographer pacifist run - no shots, grenades, melee, deaths, or restarts), That's My Ride (beat the Elite to the Banshee), Arm's Length, Clean Lap (Warthog run without being thrown out), Jiralhanae Conservationist (spare the berserk Brutes), Food Critic (an easter-egg conversation in The Maw), All Shield, No Yield (Heroic+, one mission losing only shields).
The finishers
MYTHIC (LASO clear, 50G / gold) and Fully Evolved (all other 57 unlocked - 50G / the platinum).
Q: How many achievements does Halo: Campaign Evolved have?
A: 58: worth 1000 Gamerscore on Xbox/PC, or 58 trophies on PS5 (1 platinum, 2 gold, 3 silver, 52 bronze).
Q: Does beating Legendary unlock the lower difficulty achievements?
A: Yes - difficulty achievements stack. One Legendary campaign clear unlocks Heroic, Normal, and Easy completion achievements too.
Q: Are there missable achievements?
A: No. Every mission can be replayed from mission select, and all collectibles and challenges can be mopped up later.
Q: How long does the platinum / 1000G take?
A: Roughly 25-45 hours over about 4 playthroughs: a Heroic collectible run, a Campaign Remix run, a Legendary run, and the LASO run for MYTHIC (community estimate).
Sources: full list cross-checked across GamingProMax, Beebom, NeonLightsMedia, and AllThings.How (totals verify: 1000G exactly; 52 bronze + 3 silver + 2 gold + 1 platinum); modifier-lock list via TrueAchievements/Hunters Cabin reporting of the official rule. Roadmap and time estimates are community guidance. Last updated July 28, 2026.