Every game in the Pikmin series can be completed in varying degrees. Some players may consider their play time with the game completed after just beating Story Mode, while others may want to finish everything the game has to offer. The following is a list of completion goals that exist in every game. Some of these objectives are acknowledged by the game, and unlock new content or mark something in the player's stats, while others consist of subjective goals that, in general, most players would consider part of "100%" completion of a game.
Pikmin has 3 endings: the bad ending, reached by playing all 30 days without getting enough ship parts, the good ending, reached by getting at least the 25 mandatory ship parts by the end of the 30 days, and the best ending, reached by getting all 30 ship parts.
Since each stage has a maximum number of Pikmin that can possibly be grown, it is possible to complete Challenge Mode by getting the maximum score on each stage. However, no human has ever done this, as getting a perfect score of 752 in The Distant Spring is incredibly difficult, and has only ever been done in tool-assisted superplays.
By interacting with or defeating all the creatures, it is possible to unlock all 81 entries in the Piklopedia.
On top of clearing all 30 Challenge Mode stages, the player can also beat each one with a pink flower (which is done by completing the stage with no Pikmin deaths), thus effectively completing Challenge Mode. Doing this unlocks a secret cutscene.
Getting a platinum medal in both single-player and co-op on all 36 Mission Mode stages effectively completes the mode.
Reaching the end of all 4 days in Olimar's Assignment reaches the ending of the Side Story.
Reaching the end of all 10 days in Olimar's Comeback reaches the ending of the Side Story.
Getting a platinum medal on all 14 Side Stories stages effectively completes the mode.
Unlocking all 12 Bingo Battle stages by completing the previous stage, and unlocking all variants of all stages by playing each one at least 3 times, effectively completes the mode.
Hey! Pikmin's ending occurs when the Berserk Leech Hydroe is defeated. In order to do this, the player must first collect 30000 Sparklium and reach the end of the Lushlife Murk to unlock the final area, Fragment of Hope.
Reaching the end of all 49 areas (including the secret areas, which requires completing some areas twice) and completing all regular Secret Spots will mark every level as being cleared on the area selection menu.
Hey! Pikmin also has 41 amiibo treasures, but the only way to get them all is to have all of the corresponding amiibo, or the Pikmin amiibo.
Completing an area with all 20 Pikmin alive at the end will place a gold Pikmin badge on the level in the area selection menu. If this is done for all areas, the saved game selection menu will also have a gold Pikmin badge on that save file.