Chaos Zero Nightmare Season 4 Achievement Guide: Collectibles and Stickers

To claim all limited-time stickers and profile collectibles before Season 4 ends in Chaos Zero Nightmare, prioritize high-difficulty, one-time combat clears in Sortie and milestone floor clears in the Great Rift. Cumulative tasks and generic resource farming can be completed concurrently or skipped if time is short, but exclusive cosmetic trophies disappear permanently once the season closes.

Reward Priority: Cosmetics vs. Cumulative Grinds

Seasonal tasks fall into two categories: static one-time clears and cumulative volume grinds. Focus your remaining daily entries on one-time clear conditions first.

• High Priority (One-Time Clears): Defeating high-tier Sortie bosses under strict restrictions and reaching target depth milestones in the Great Rift award exclusive Season 4 stickers and profile trophies. These cannot be acquired after the seasonal reset.
• Low Priority (Cumulative Grinds): Milestones for repeating specific combat mechanics, triggering card interactions, or accumulating raw battle points primarily award upgrade materials and standard currencies. These resources remain obtainable through standard gameplay in subsequent patches.

Sortie Boss Objectives and Squad Setups

Sortie achievements test roster performance under strict encounter parameters. You must satisfy the condition and successfully clear the node for the achievement to register.

When targeting turn-count thresholds, prioritize offensive buffers to front-load damage within the opening combat rounds. For survival objectives, bring dedicated shield providers or Morale-preserving supports to prevent late-fight casualty disqualifications.

Great Rift Depth and Deck Milestones

Great Rift achievements require clearing specific floor depths, navigating node types, and building targeted card decks during exploration runs.

• Route Planning: Check your remaining Rift tasks before starting an exploration run. If an achievement requires landing on non-combat spaces, steer pathing toward rest or mystery nodes instead of elite combat rooms.
• Drafting Requirements: Certain achievements require finishing a sector with specific desire card classifications or archive states. Pick achievement-relevant cards during early sector rewards rather than drafting exclusively for generic deck power.
• Depth Thresholds: Reaching the deepest seasonal floor guardians awards the highest tier of collectible trophies. Ensure your squad maintains adequate sustain across early sectors to survive late-depth encounter hazards.

Run Efficiency: Stacking Objectives

Do not run separate Sortie or Rift attempts for single tasks. Combine conditions into coordinated runs to conserve tickets and stamina:

1. Layer Roster Requirements on Depth Pushes: If a task requires using a specific combatant class or element, place that unit into your Great Rift depth progression team instead of running low-tier standalone stages.
2. Farm Trigger Counts on High-HP Targets: Achievements that require landing critical hits, status procs, or card chain combos progress faster against multi-phase elite encounters where enemies survive multiple turns.
3. Commit Early to Card Archetypes: When entering draft-dependent modes, select your target card condition at the first reward screen to hit the required quota before reaching the final sector boss.

End-of-Season Claim Checklist

Progress does not automatically convert into inventory items. Complete these verification steps before the seasonal cutoff:

• Confirm all one-time Sortie boss milestones display a completed status tag.
• Check your Great Rift record to verify your highest depth cleared meets the top trophy requirement.
• Review character-specific combo and mechanic counters to confirm they reached 100%.
• Open the Season 4 achievement menu and manually claim every unlocked sticker, badge, and collectible. Any reward left unclaimed when maintenance begins is permanently lost.